[lld] [lld][ELF] improve AMD error message (PR #135082)

[Maksim Levental via llvm-commits]

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@@ -143,7 +143,7 @@ uint32_t AMDGPU::calcEFlags() const {
   case ELFABIVERSION_AMDGPU_HSA_V6:
     return calcEFlagsV6();
   default:
-    Err(ctx) << "unknown abi version: " << abiVersion;
+    Err(ctx) << "unknown amd-hsa abi version: " << static_cast<int>(abiVersion);
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makslevental wrote:

@MaskRay `amdgpu-abi-version-err.s` is not the right place because `llvm-mc` already [catches illegal ABI](https://github.com/makslevental/llvm-project/blob/3e742b517a0606bfed329dfcb8c34c614ed73ea7/llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp#L234) -  you need an actual ELF file. I don't see any such files around... 

https://github.com/llvm/llvm-project/pull/135082