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

[Farzon Lotfi via llvm-commits]

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@@ -28,6 +28,8 @@ bool DirectXTTIImpl::isTargetIntrinsicTriviallyScalarizable(
   switch (ID) {
   case Intrinsic::dx_frac:
   case Intrinsic::dx_rsqrt:
+  case Intrinsic::dx_firstbituhigh:
+  case Intrinsic::dx_firstbitshigh:
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farzonl wrote:

you will want to rebase, line ending change made it so a bunch of our prs are getting merge conflcts on this file.

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