[clang] [HLSL] select scalar overloads for vector conditions (PR #129396)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff b65e0947cade9bd39036a7700b54c1df4ec00756 999c9253dc69c43f2d5d686bb4e9a9fd2f8783d4 --extensions h,cpp -- clang/lib/CodeGen/CGBuiltin.cpp clang/lib/Headers/hlsl/hlsl_detail.h clang/lib/Headers/hlsl/hlsl_intrinsics.h clang/lib/Sema/SemaHLSL.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/hlsl/hlsl_detail.h b/clang/lib/Headers/hlsl/hlsl_detail.h
index daccd2d793..1587f233ac 100644
--- a/clang/lib/Headers/hlsl/hlsl_detail.h
+++ b/clang/lib/Headers/hlsl/hlsl_detail.h
@@ -95,8 +95,7 @@ constexpr vector<T, L> reflect_vec_impl(vector<T, L> I, vector<T, L> N) {
 #endif
 }
 
-template<typename T>
-struct is_arithmetic {
+template <typename T> struct is_arithmetic {
   static const bool Value = __is_arithmetic(T);
 };
 
diff --git a/clang/lib/Headers/hlsl/hlsl_intrinsics.h b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
index 77a7f773b8..07ee0be7bb 100644
--- a/clang/lib/Headers/hlsl/hlsl_intrinsics.h
+++ b/clang/lib/Headers/hlsl/hlsl_intrinsics.h
@@ -2246,7 +2246,6 @@ template <typename T, int Sz>
 _HLSL_BUILTIN_ALIAS(__builtin_hlsl_select)
 vector<T, Sz> select(vector<bool, Sz>, vector<T, Sz>, vector<T, Sz>);
 
-
 /// \fn vector<T,Sz> select(vector<bool,Sz> Conds, T TrueVal,
 ///                         vector<T,Sz> FalseVals)
 /// \brief ternary operator for vectors. All vectors must be the same size.

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https://github.com/llvm/llvm-project/pull/129396