[clang] AMDGPU: Remove "gws" from the “read-only” target feature list (PR #148141)

[Changpeng Fang via cfe-commits]

================
@@ -266,7 +266,7 @@ AMDGPUTargetInfo::AMDGPUTargetInfo(const llvm::Triple 
&Triple,
 
   MaxAtomicPromoteWidth = MaxAtomicInlineWidth = 64;
   CUMode = !(GPUFeatures & llvm::AMDGPU::FEATURE_WGP);
-  for (auto F : {"image-insts", "gws", "vmem-to-lds-load-insts"})
+  for (auto F : {"image-insts", "vmem-to-lds-load-insts"})
     ReadOnlyFeatures.insert(F);
----------------
changpeng wrote:

> What does this `ReadOnlyFeatures` do?

Prevent clang from writing a feature to the IR. But I can not see much benefit 
in doing that.

https://github.com/llvm/llvm-project/pull/148141
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