[DebugInfo] Fix dumping CIE ID in .eh_frame sections.

We do not keep the actual value of the CIE ID field, because it is
predefined, and use a constant when dumping a CIE record. The issue
was that the predefined value is different for .debug_frame and
.eh_frame sections, but we always printed the one which corresponds
to .debug_frame. The patch fixes that by choosing an appropriate
constant to print.

See the following for more information about .eh_frame sections:
https://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html

Differential Revision: https://reviews.llvm.org/D73627

lld/test/ELF/eh-frame-hdr-augmentation.s

@@ -5,7 +5,7 @@
 
 // CHECK: .eh_frame contents:
 
-// CHECK:      00000000 0000001c ffffffff CIE
+// CHECK:      00000000 0000001c 00000000 CIE
 // CHECK-NEXT:   Version:                       1
 // CHECK-NEXT:   Augmentation:             "zPLR"
 // CHECK-NEXT:   Code alignment factor: 1

llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp

@@ -287,7 +287,7 @@ void CFIProgram::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH,
 
 void CIE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const {
   OS << format("%08x %08x %08x CIE", (uint32_t)Offset, (uint32_t)Length,
-               DW_CIE_ID)
+               IsEH ? 0 : DW_CIE_ID)
      << "\n";
   OS << format("  Version:               %d\n", Version);
   OS << "  Augmentation:          \"" << Augmentation << "\"\n";

llvm/test/DebugInfo/RISCV/eh-frame.s

@@ -8,7 +8,7 @@ func:
   ret
   .cfi_endproc
 
-# CHECK: 00000000 00000010 ffffffff CIE
+# CHECK: 00000000 00000010 00000000 CIE
 # CHECK:   Version:               1
 # CHECK:   Augmentation:          "zR"
 # CHECK:   Code alignment factor: 1

llvm/test/MC/Mips/eh-frame.s

@@ -54,7 +54,7 @@ func:
 // PIC64-NEXT:      R_MIPS_PC32/R_MIPS_NONE/R_MIPS_NONE
 // RELOCS-NEXT:   }
 
-// DWARF32: 00000000 00000010 ffffffff CIE
+// DWARF32: 00000000 00000010 00000000 CIE
 // DWARF32-NEXT:     Version:               1
 // DWARF32-NEXT:     Augmentation:          "zR"
 // DWARF32-NEXT:     Code alignment factor: 1
@@ -73,7 +73,7 @@ func:
 // DWARF32-NEXT:     DW_CFA_nop:
 
 
-// DWARF64: 00000000 00000010 ffffffff CIE
+// DWARF64: 00000000 00000010 00000000 CIE
 // DWARF64-NEXT:     Version:               1
 // DWARF64-NEXT:     Augmentation:          "zR"
 // DWARF64-NEXT:     Code alignment factor: 1

llvm/test/MC/X86/return-column.s

@@ -33,11 +33,11 @@ h:
 // CHECK-ASM-ROUNDTRIP-NEXT: .cfi_return_column 0
 // CHECK-ASM-ROUNDTRIP: .cfi_endproc
 
-// CHECK-EH_FRAME: 00000000 00000014 ffffffff CIE
+// CHECK-EH_FRAME: 00000000 00000014 00000000 CIE
 // CHECK-EH_FRAME:   Return address column: 0
 
-// CHECK-EH_FRAME: 0000002c 00000014 ffffffff CIE
+// CHECK-EH_FRAME: 0000002c 00000014 00000000 CIE
 // CHECK-EH_FRAME:   Return address column: 65
 
-// CHECK-EH_FRAME-NOT: ........ 00000014 ffffffff CIE
+// CHECK-EH_FRAME-NOT: ........ 00000014 00000000 CIE
 

llvm/test/tools/llvm-dwarfdump/X86/eh-frame-return-address-reg.s

@@ -10,7 +10,7 @@
 # checks that we are able to dump it correctly.
 
 # CHECK:      .eh_frame contents:
-# CHECK:      00000000 00000010 ffffffff CIE
+# CHECK:      00000000 00000010 00000000 CIE
 # CHECK-NEXT:   Version:               1
 # CHECK-NEXT:   Augmentation:          "zR"
 # CHECK-NEXT:   Code alignment factor: 1

llvm/test/tools/llvm-objdump/eh_frame-arm64.test

@@ -2,7 +2,7 @@
 
 # CHECK: .eh_frame contents:
 
-# CHECK: 00000000 00000010 ffffffff CIE
+# CHECK: 00000000 00000010 00000000 CIE
 # CHECK:   Version:               1
 # CHECK:   Augmentation:          "zR"
 # CHECK:   Code alignment factor: 1

llvm/test/tools/llvm-objdump/eh_frame-coff.test

@@ -2,7 +2,7 @@
 
 # CHECK: .eh_frame contents:
 
-# CHECK: 00000000 0000001c ffffffff CIE
+# CHECK: 00000000 0000001c 00000000 CIE
 # CHECK:   Version:               1
 # CHECK:   Augmentation:          "zPLR"
 # CHECK:   Code alignment factor: 1

llvm/test/tools/llvm-objdump/eh_frame-mipsel.test

@@ -2,7 +2,7 @@
 
 # CHECK: .eh_frame contents:
 
-# CHECK: 00000000 00000018 ffffffff CIE
+# CHECK: 00000000 00000018 00000000 CIE
 # CHECK:   Version:               1
 # CHECK:   Augmentation:          "zPLR"
 # CHECK:   Code alignment factor: 1
@@ -19,7 +19,7 @@
 # CHECK:   DW_CFA_offset: reg31 -4
 # CHECK:   DW_CFA_nop:
 
-# CHECK: 00000038 00000000 ffffffff CIE
+# CHECK: 00000038 00000000 00000000 CIE
 # CHECK:   Version:               0
 # CHECK:   Augmentation:          ""
 # CHECK:   Code alignment factor: 0

llvm/test/tools/llvm-objdump/eh_frame_zero_cie.test

@@ -2,7 +2,7 @@
 
 # CHECK: .eh_frame contents:
 
-# CHECK: 00000000 00000000 ffffffff CIE
+# CHECK: 00000000 00000000 00000000 CIE
 # CHECK:   Version:               0
 # CHECK:   Augmentation:          ""
 # CHECK:   Code alignment factor: 0