[clang] [llvm] [HLSL] implement elementwise firstbithigh hlsl builtin (PR #111082)

[Farzon Lotfi via cfe-commits]

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@@ -2515,6 +2525,10 @@ bool SPIRVInstructionSelector::selectIntrinsic(Register 
ResVReg,
     return selectExtInst(ResVReg, ResType, I, CL::rsqrt, GL::InverseSqrt);
   case Intrinsic::spv_sign:
     return selectSign(ResVReg, ResType, I);
+  case Intrinsic::spv_firstbituhigh:
----------------
farzonl wrote:

Maybe add a comment saying we are only setting the GL extension because there 
is no CL equivalent.

https://github.com/llvm/llvm-project/pull/111082
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