[clang] [llvm] [HLSL] Move `normalize` implementation to header files (PR #216228)

[Farzon Lotfi via llvm-commits]

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@@ -28,6 +28,14 @@ length_impl(vector<T, N> X) {
 #endif
 }
 
+template <typename T> constexpr T normalize_impl(T X) {
+#if (__has_builtin(__builtin_spirv_normalize))
+  return __builtin_spirv_normalize(X);
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farzonl wrote:

To be clear we are doing it this way because of concerns with the difficulty of the pattern match in spirv?

https://github.com/llvm/llvm-project/pull/216228