[ELF][test] Add some additional .eh_frame/.eh_frame_hdr testing

This patch adds a few extra cases to the existing testing for eh_frame
and eh_frame_hdr behaviour in LLD. They all come from a private
testsuite we are trying to migrate to lit.

Reviewed by: grimar, MaskRay

Differential Revision: https://reviews.llvm.org/D82852

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

@@ -0,0 +1,37 @@
+# REQUIRES: x86
+
+# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t
+# RUN: ld.lld %t %t -o %t2 --eh-frame-hdr
+# RUN: llvm-readelf -u --symbols %t2 | FileCheck %s
+
+# CHECK:      EHFrameHeader {
+# CHECK-NEXT:   Address:
+# CHECK-NEXT:   Offset:
+# CHECK-NEXT:   Size: 0x14
+# CHECK-NEXT:   Corresponding Section: .eh_frame_hdr
+# CHECK-NEXT:   Header {
+# CHECK-NEXT:     version: 1
+# CHECK-NEXT:     eh_frame_ptr_enc:
+# CHECK-NEXT:     fde_count_enc:
+# CHECK-NEXT:     table_enc:
+# CHECK-NEXT:     eh_frame_ptr:
+# CHECK-NEXT:     fde_count: 1
+# CHECK-NEXT:     entry 0 {
+# CHECK-NEXT:       initial_location: 0x[[# %x, SYM:]]
+# CHECK-NEXT:       address: 0x[[# %x, FDE:]]
+# CHECK-NEXT:     }
+# CHECK-NEXT:   }
+# CHECK-NEXT: }
+
+# CHECK:      [0x[[# FDE]]] FDE
+
+# CHECK:      Symbol table
+# CHECK-NEXT:    Num:    Value        {{.*}} Name
+# CHECK:              {{0+}}[[# SYM]] {{.*}} bar
+
+.section .text.bar,"axG",@progbits,bar,comdat
+.global bar
+bar:
+.cfi_startproc
+    ret
+.cfi_endproc

lld/test/ELF/eh-frame-merge.s

@@ -3,6 +3,11 @@
 // RUN: ld.lld --hash-style=sysv %t.o %t.o -o %t -shared
 // RUN: llvm-readobj -S --section-data %t | FileCheck %s
 
+/// Also show that the merging happens when going via a -r link.
+// RUN: ld.lld -r %t.o %t.o -o %t.r.o
+// RUN: ld.lld --hash-style=sysv %t.r.o -o %t2 -shared
+// RUN: llvm-readobj -S --section-data %t2 | FileCheck %s
+
         .section	foo,"ax",@progbits
 	.cfi_startproc
         nop

lld/test/ELF/eh-frame-type.test

@@ -1,17 +1,26 @@
-# RUN: yaml2obj %s -o %t.o
-# RUN: ld.lld %t.o -o %t -shared
-# RUN: llvm-readobj -S %t | FileCheck %s
+## Show that LLD can handle .eh_frame sections of different types.
+
+# RUN: yaml2obj %s -o %t1.o -D TYPE=SHT_PROGBITS
+# RUN: ld.lld %t1.o -o %t1
+# RUN: llvm-readobj -S %t1 | FileCheck %s
+
+# RUN: yaml2obj %s -o %t2.o -D TYPE=SHT_X86_64_UNWIND
+# RUN: ld.lld %t2.o -o %t2
+# RUN: llvm-readobj -S %t2 | FileCheck %s
+
+# RUN: ld.lld %t1.o %t2.o -o %tboth
+# RUN: llvm-readobj -S %tboth | FileCheck %s
 
 # CHECK:      Name: .eh_frame
 # CHECK-NEXT: Type: SHT_PROGBITS
 
-!ELF
+--- !ELF
 FileHeader:
-  Class:           ELFCLASS64
-  Data:            ELFDATA2LSB
-  Type:            ET_REL
-  Machine:         EM_X86_64
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_X86_64
 Sections:
-  - Name:            .eh_frame
-    Type:            SHT_PROGBITS
-    Flags:           [ SHF_ALLOC ]
+  - Name:  .eh_frame
+    Type:  [[TYPE]]
+    Flags: [ SHF_ALLOC ]