[test] Move AMDGPU reloc test from Object to tools/llvm-readobj and simplify it

[MaskRay]

Summary

We already have some reloc-types-elf-*.test serving the similar purpose.

[jhenderson]

LGTM.

llvm/test/Object/AMDGPU/elf64-relocs.yaml

-# RUN: yaml2obj %s -o %t
-# RUN: llvm-readobj -r %t | FileCheck %s
-
-# CHECK: Relocations [
-# CHECK:   Section (2) .rela.text {
-# CHECK:     0x0  R_AMDGPU_NONE           - 0x0
-# CHECK:     0x2  R_AMDGPU_ABS32_LO       - 0x0
-# CHECK:     0x4  R_AMDGPU_ABS32_HI       - 0x0
-# CHECK:     0x6  R_AMDGPU_ABS64          - 0x0
-# CHECK:     0x8  R_AMDGPU_REL32          - 0x0
-# CHECK:     0x10 R_AMDGPU_REL64          - 0x0
-# CHECK:     0x12 R_AMDGPU_ABS32          - 0x0
-# CHECK:     0x14 R_AMDGPU_GOTPCREL       - 0x0
-# CHECK:     0x16 R_AMDGPU_GOTPCREL32_LO  - 0x0
-# CHECK:     0x18 R_AMDGPU_GOTPCREL32_HI  - 0x0
-# CHECK:     0x20 R_AMDGPU_REL32_LO       - 0x0
-# CHECK:     0x22 R_AMDGPU_REL32_HI       - 0x0
-# CHECK:     0x24 R_AMDGPU_RELATIVE64     - 0x0
-# CHECK:   }
-# CHECK: ]
-
-!ELF
-FileHeader:
-  Class:           ELFCLASS64
-  Data:            ELFDATA2LSB
-  Type:            ET_REL
-  Machine:         EM_AMDGPU
-Sections:
-  - Type:            SHT_PROGBITS
-    Name:            .text
-    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
-    AddressAlign:    0x08
-    Content:         0000000000000000
-  - Type:            SHT_RELA
-    Name:            .rela.text
-    Link:            .symtab
-    Info:            .text
-    AddressAlign:    0x08
-    Relocations:
-      - Type:            R_AMDGPU_NONE
-      - Offset:          0x2
-        Type:            R_AMDGPU_ABS32_LO
-      - Offset:          0x4
-        Type:            R_AMDGPU_ABS32_HI
-      - Offset:          0x6
-        Type:            R_AMDGPU_ABS64
-      - Offset:          0x8
-        Type:            R_AMDGPU_REL32
-      - Offset:          0x10
-        Type:            R_AMDGPU_REL64
-      - Offset:          0x12
-        Type:            R_AMDGPU_ABS32
-      - Offset:          0x14
-        Type:            R_AMDGPU_GOTPCREL
-      - Offset:          0x16
-        Type:            R_AMDGPU_GOTPCREL32_LO
-      - Offset:          0x18
-        Type:            R_AMDGPU_GOTPCREL32_HI
-      - Offset:          0x20
-        Type:            R_AMDGPU_REL32_LO
-      - Offset:          0x22
-        Type:            R_AMDGPU_REL32_HI
-      - Offset:          0x24
-        Type:            R_AMDGPU_RELATIVE64
-
-Symbols:
-  - Name:            .text
-    Type:            STT_SECTION
-    Section:         .text
-  - Name:            main
-    Type:            STT_FUNC
-    Section:         .text
-    Size:            0x08
-    Binding:         STB_GLOBAL

llvm/test/tools/llvm-readobj/ELF/reloc-types-elf-amdgpu.test

+## Test that llvm-readobj/llvm-readelf shows proper relocation type
+## names and values for AMDGPU target.
+
+# RUN: yaml2obj %s -o %t
+# RUN: llvm-readobj -r %t | FileCheck %s
+
+# CHECK:      Section ({{.*}}) .rela.text {
+# CHECK-NEXT:   0x0 R_AMDGPU_NONE           - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_ABS32_LO       - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_ABS32_HI       - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_ABS64          - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_REL32          - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_REL64          - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_ABS32          - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_GOTPCREL       - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_GOTPCREL32_LO  - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_GOTPCREL32_HI  - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_REL32_LO       - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_REL32_HI       - 0x0
+# CHECK-NEXT:   0x0 R_AMDGPU_RELATIVE64     - 0x0
+# CHECK-NEXT: }
+
+!ELF
+FileHeader:
+  Class:   ELFCLASS64
+  Data:    ELFDATA2LSB
+  Type:    ET_REL
+  Machine: EM_AMDGPU
+Sections:
+  - Name: .rela.text
+    Type: SHT_RELA
+    Relocations:
+      - Type: R_AMDGPU_NONE
+      - Type: R_AMDGPU_ABS32_LO
+      - Type: R_AMDGPU_ABS32_HI
+      - Type: R_AMDGPU_ABS64
+      - Type: R_AMDGPU_REL32
+      - Type: R_AMDGPU_REL64
+      - Type: R_AMDGPU_ABS32
+      - Type: R_AMDGPU_GOTPCREL
+      - Type: R_AMDGPU_GOTPCREL32_LO
+      - Type: R_AMDGPU_GOTPCREL32_HI
+      - Type: R_AMDGPU_REL32_LO
+      - Type: R_AMDGPU_REL32_HI
+      - Type: R_AMDGPU_RELATIVE64