[AMDGPU][LLD] Adding support for ABI version 5 option

[lamb-j]

Summary

Code object version 5 will use the same EFlags as version 4, so we only need to add an additional case

[lamb-j]

Updating commit message

[b-sumner]

This change goes along with 1194b9cdda30d and should probably have been landed with it.

[kzhuravl]

Do we need to add the test for it?

[lamb-j]

Adding test

[MaskRay]

Can the test be placed in the existing amdgpu-tid.s
The difference with ELFABIVERSION_AMDGPU_HSA_V4 is so small that I don't think we need so many extra RUN lines.

[lamb-j]

Switching test

[MaskRay]

LGTM.

lld/ELF/Arch/AMDGPU.cpp

 //===- AMDGPU.cpp ---------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
uint32_t AMDGPU::calcEFlags() const {
 
   uint8_t abiVersion = cast<ObjFile<ELF64LE>>(objectFiles[0])->getObj()
       .getHeader().e_ident[EI_ABIVERSION];
   switch (abiVersion) {
   case ELFABIVERSION_AMDGPU_HSA_V2:
   case ELFABIVERSION_AMDGPU_HSA_V3:
     return calcEFlagsV3();
   case ELFABIVERSION_AMDGPU_HSA_V4:
+  case ELFABIVERSION_AMDGPU_HSA_V5:
     return calcEFlagsV4();
   default:
     error("unknown abi version: " + Twine(abiVersion));
     return 0;
   }
 }
 
 void AMDGPU::relocate(uint8_t *loc, const Relocation &rel, uint64_t val) const {