[clang] [HLSL] Add `InterlockedMax` function and resource methods (PR #222160)

[Joshua Batista via cfe-commits]

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@@ -49,4 +57,6 @@ void main(uint3 id : SV_DispatchThreadID) {
   InterlockedOr(UOut[id], 1u);
   InterlockedXor(UOut[id], 1u);
   InterlockedMin(UOut[id], 1u);
+  InterlockedMax(Out[id.xy], 1);
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bob80905 wrote:

Out is RWTexture2D<int> and id is uint3. Out[id] compiles but emits -Wvector-conversion "implicit conversion truncates vector". Out[id.xy] is the explicit, warning-free form and matches the pre-existing InterlockedAdd/InterlockedMin lines above it. UOut is RWTexture2DArray<uint>, which takes all 3 components, so it uses id. 

https://github.com/llvm/llvm-project/pull/222160