[clang] [llvm] [NFC][AMDGPU] Clean-up feature parsing for AMDGCNSPIRV. (PR #123519)

[Shilei Tian via cfe-commits]

================
@@ -323,43 +323,59 @@ void AMDGPU::fillAMDGPUFeatureMap(StringRef GPU, const 
Triple &T,
                                   StringMap<bool> &Features) {
   // XXX - What does the member GPU mean if device name string passed here?
   if (T.isSPIRV() && T.getOS() == Triple::OSType::AMDHSA) {
-    // AMDGCN SPIRV must support the union of all AMDGCN features.
+    // AMDGCN SPIRV must support the union of all AMDGCN features. This list
----------------
shiltian wrote:

Technically we added those features via `.td` files so it could potentially 
generate a file for this one to include.

https://github.com/llvm/llvm-project/pull/123519
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