[clang] [X86] avx512fp16intrin.h - allow _mm512_cvtsh_h to be used in constexpr (PR #162114)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,h -- clang/lib/Headers/avx512fp16intrin.h clang/test/CodeGen/X86/avx512fp16-builtins.c
``````````

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``````````diff
diff --git a/clang/lib/Headers/avx512fp16intrin.h b/clang/lib/Headers/avx512fp16intrin.h
index d951ba0f0..51c7de26c 100644
--- a/clang/lib/Headers/avx512fp16intrin.h
+++ b/clang/lib/Headers/avx512fp16intrin.h
@@ -41,8 +41,8 @@ typedef _Float16 __m512h_u __attribute__((__vector_size__(64), __aligned__(1)));
 #define __DEFAULT_FN_ATTRS128_CONSTEXPR __DEFAULT_FN_ATTRS128
 #endif
 
-static __inline__ _Float16 __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_cvtsh_h(__m512h __a) {
+static __inline__ _Float16
+    __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_cvtsh_h(__m512h __a) {
   return __a[0];
 }
 

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https://github.com/llvm/llvm-project/pull/162114