[MC] Set SHF_INFO_LINK on SHT_REL/SHT_RELA sections

sh_info links to a section, therefore SHF_INFO_LINK should be set as GNU as
does. The issue has been benign because linkers kindly combines relocation
sections w/ and w/o the flag.

llvm/lib/MC/ELFObjectWriter.cpp

@@ -796,7 +796,7 @@ MCSectionELF *ELFWriter::createRelocationSection(MCContext &Ctx,
   else
     EntrySize = is64Bit() ? sizeof(ELF::Elf64_Rel) : sizeof(ELF::Elf32_Rel);
 
-  unsigned Flags = 0;
+  unsigned Flags = ELF::SHF_INFO_LINK;
   if (Sec.getFlags() & ELF::SHF_GROUP)
     Flags = ELF::SHF_GROUP;
 

llvm/test/ExecutionEngine/RuntimeDyld/SystemZ/cfi-relo-pc64.s

@@ -18,6 +18,7 @@ f1:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-adjust-cfa-offset.s

@@ -55,6 +55,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-advance-loc2.s

@@ -36,6 +36,7 @@ f:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-def-cfa-offset.s

@@ -38,6 +38,7 @@ f:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-def-cfa-register.s

@@ -37,6 +37,7 @@ f:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-def-cfa.s

@@ -33,6 +33,7 @@ f:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-escape.s

@@ -38,6 +38,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-offset.s

@@ -33,6 +33,7 @@ f:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-register.s

@@ -38,6 +38,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-rel-offset.s

@@ -48,6 +48,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-rel-offset2.s

@@ -33,6 +33,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-remember.s

@@ -40,6 +40,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-restore.s

@@ -34,6 +34,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-same-value.s

@@ -38,6 +38,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-undefined.s

@@ -38,6 +38,7 @@ f:
 // CHECK-NEXT:     Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-window-save.s

@@ -40,6 +40,7 @@ f:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi-zero-addr-delta.s

@@ -41,6 +41,7 @@ f:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cfi.s

@@ -358,6 +358,7 @@ f37:
 // CHECK:          Name: .rela.eh_frame
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/cgprofile.s

@@ -33,7 +33,8 @@ late3:
 
 # CHECK:      Name: .rel.llvm.call-graph-profile (28)
 # CHECK-NEXT: Type: SHT_REL (0x9)
-# CHECK-NEXT: Flags [ (0x0)
+# CHECK-NEXT: Flags [ (0x40)
+# CHECK-NEXT:   SHF_INFO_LINK
 # CHECK-NEXT: ]
 # CHECK-NEXT: Address: 0x0
 # CHECK-NEXT: Offset: 0x140

llvm/test/MC/ELF/relocation-pc.s

@@ -11,6 +11,7 @@
 // CHECK:          Name: .rela.text
 // CHECK-NEXT:     Type: SHT_RELA
 // CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/ELF/rename.s

@@ -19,7 +19,8 @@ defined3:
 // CHECK:          Index:
 // CHECK:          Name: .rela.text
 // CHECK-NEXT:     Type: SHT_RELA (0x4)
-// CHECK-NEXT:     Flags [ (0x0)
+// CHECK-NEXT:     Flags [
+// CHECK-NEXT:       SHF_INFO_LINK
 // CHECK-NEXT:     ]
 // CHECK-NEXT:     Address: 0x0
 // CHECK-NEXT:     Offset:

llvm/test/MC/PowerPC/ppc64-initial-cfa.s

@@ -40,7 +40,8 @@ _proc:
 # STATIC:      Section {
 # STATIC:        Name: .rela.eh_frame
 # STATIC-NEXT:   Type: SHT_RELA
-# STATIC-NEXT:   Flags [ (0x0)
+# STATIC-NEXT:   Flags [
+# STATIC-NEXT:     SHF_INFO_LINK
 # STATIC-NEXT:   ]
 # STATIC-NEXT:   Address:
 # STATIC-NEXT:   Offset:
@@ -81,7 +82,8 @@ _proc:
 # PIC:      Section {
 # PIC:        Name: .rela.eh_frame
 # PIC-NEXT:   Type: SHT_RELA
-# PIC-NEXT:   Flags [ (0x0)
+# PIC-NEXT:   Flags [
+# PIC-NEXT:     SHF_INFO_LINK
 # PIC-NEXT:   ]
 # PIC-NEXT:   Address:
 # PIC-NEXT:   Offset: