[clang] [llvm] [AMDGPU] Error out in clang if wavefront64 is used on gfx1250 (PR #153693)

[Stanislav Mekhanoshin via cfe-commits]

================
@@ -774,6 +774,18 @@ static bool isWave32Capable(StringRef GPU, const Triple 
&T) {
   return IsWave32Capable;
 }
 
+static bool isWave64Capable(StringRef GPU, const Triple &T) {
+  if (T.isAMDGCN()) {
----------------
rampitec wrote:

So to clarify, do you suggest adding a `wavefrontsize32` or `wavefrontsize64` 
feature in the `fillAMDGPUFeatureMap` to every target which can only support 
one wavefront size? And then if it is in the `Features` map assume the target 
cannot support another?

https://github.com/llvm/llvm-project/pull/153693
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