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One clang builtins are introduced uint WaveActiveCountBits( bool bBit ) as Langugage builtin function for HLSL. The detail for WaveActiveCountBits is at https://github.com/microsoft/DirectXShaderCompiler/wiki/Wave-Intrinsics#uint-waveactivecountbits-bool-bbit- This is only clang part change to make WaveActiveCountBits into AST. llvm intrinsic for WaveActiveCountBits will be add in separate PR. Reviewed By: Anastasia Differential Revision: https://reviews.llvm.org/D126857