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

[Farzon Lotfi via cfe-commits]

================
@@ -84,4 +84,6 @@ let TargetPrefix = "spv" in {
     [IntrNoMem, Commutative] >;
   def int_spv_wave_is_first_lane : DefaultAttrsIntrinsic<[llvm_i1_ty], [], 
[IntrConvergent]>;
   def int_spv_sign : DefaultAttrsIntrinsic<[LLVMScalarOrSameVectorWidth<0, 
llvm_i32_ty>], [llvm_any_ty], [IntrNoMem]>;
+  def int_spv_firstbituhigh : DefaultAttrsIntrinsic<[llvm_anyint_ty], 
[LLVMMatchType<0>], [IntrNoMem]>;
----------------
farzonl wrote:

```suggestion
  def int_spv_firstbituhigh : 
DefaultAttrsIntrinsic<[LLVMScalarOrSameVectorWidth<0, llvm_i32_ty>], 
[llvm_anyint_ty], [IntrNoMem]>;
```

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