[clang] [Headers][X86] Allow _mm512_set1_epi8/16/pd/ps intrinsics to be used in constexpr (PR #152746)

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


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You can test this locally with the following command:
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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions c,h -- clang/lib/Headers/avx512fintrin.h clang/test/CodeGen/X86/avx512f-builtins.c
``````````

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<details>
<summary>
View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/avx512fintrin.h b/clang/lib/Headers/avx512fintrin.h
index 95b80cc59..b4a0ff206 100644
--- a/clang/lib/Headers/avx512fintrin.h
+++ b/clang/lib/Headers/avx512fintrin.h
@@ -278,21 +278,18 @@ _mm512_setzero_pd(void) {
 }
 
 static __inline __m512 __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_set1_ps(float __w)
-{
+_mm512_set1_ps(float __w) {
   return __extension__ (__m512){ __w, __w, __w, __w, __w, __w, __w, __w,
                                  __w, __w, __w, __w, __w, __w, __w, __w  };
 }
 
 static __inline __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_set1_pd(double __w)
-{
+_mm512_set1_pd(double __w) {
   return __extension__ (__m512d){ __w, __w, __w, __w, __w, __w, __w, __w };
 }
 
 static __inline __m512i __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_set1_epi8(char __w)
-{
+_mm512_set1_epi8(char __w) {
   return __extension__ (__m512i)(__v64qi){
     __w, __w, __w, __w, __w, __w, __w, __w,
     __w, __w, __w, __w, __w, __w, __w, __w,
@@ -305,8 +302,7 @@ _mm512_set1_epi8(char __w)
 }
 
 static __inline __m512i __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_set1_epi16(short __w)
-{
+_mm512_set1_epi16(short __w) {
   return __extension__ (__m512i)(__v32hi){
     __w, __w, __w, __w, __w, __w, __w, __w,
     __w, __w, __w, __w, __w, __w, __w, __w,

``````````

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https://github.com/llvm/llvm-project/pull/152746