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

[Sarah Spall via cfe-commits]

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@@ -424,7 +424,7 @@ Register SPIRVGlobalRegistry::getOrCreateCompositeOrNull(
     LLT LLTy = LLT::scalar(64);
     Register SpvVecConst =
         CurMF->getRegInfo().createGenericVirtualRegister(LLTy);
-    CurMF->getRegInfo().setRegClass(SpvVecConst, &SPIRV::iIDRegClass);
+    CurMF->getRegInfo().setRegClass(SpvVecConst, getRegClass(SpvType));
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spall wrote:

Happy to put it in its own PR if that is what people want. I just left it here 
since it is such a small change.

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