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* Implement SPV_EXT_fragment_invocation_density
-Adds semantics SV_FragSize and SV_FragInvocationCount and implements them for SPIRV and GLSL using the appropriate target builtins from extensions.
-Adds test case checking for expected target builtins from these semantics.
-For future work, could implement SV_FragSize using pixel shader input SV_ShadingRate for HLSL, and SV_FragInvocationCount needs research.
Fixes #7974
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* address review feedback
https://github.com/shader-slang/slang/pull/8037#pullrequestreview-3084645845
* fixup format
* review feedback
https://github.com/shader-slang/slang/pull/8037#pullrequestreview-3086442819
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