[clang] [Headers][X86] Add constexpr support for some AVX[512] intrinsics. (PR #156567)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,c -- clang/lib/Headers/avx512dqintrin.h clang/lib/Headers/avx512vlintrin.h clang/test/CodeGen/X86/avx512dq-builtins.c clang/test/CodeGen/X86/avx512vl-builtins.c
``````````

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``````````diff
diff --git a/clang/lib/Headers/avx512dqintrin.h b/clang/lib/Headers/avx512dqintrin.h
index ee211d3ea..a8435d1cb 100644
--- a/clang/lib/Headers/avx512dqintrin.h
+++ b/clang/lib/Headers/avx512dqintrin.h
@@ -483,8 +483,8 @@ _mm512_maskz_cvtps_epu64 (__mmask8 __U, __m256 __A) {
                                              (__v8di)_mm512_setzero_si512(), \
                                              (__mmask8)(U), (int)(R)))
 
-static __inline__ __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_cvtepi64_pd(__m512i __A) {
+static __inline__ __m512d
+    __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_cvtepi64_pd(__m512i __A) {
   return (__m512d)__builtin_convertvector((__v8di)__A, __v8df);
 }
 
@@ -713,8 +713,8 @@ _mm512_maskz_cvttps_epu64 (__mmask8 __U, __m256 __A) {
                                               (__v8di)_mm512_setzero_si512(), \
                                               (__mmask8)(U), (int)(R)))
 
-static __inline__ __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_cvtepu64_pd(__m512i __A) {
+static __inline__ __m512d
+    __DEFAULT_FN_ATTRS512_CONSTEXPR _mm512_cvtepu64_pd(__m512i __A) {
   return (__m512d)__builtin_convertvector((__v8du)__A, __v8df);
 }
 

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https://github.com/llvm/llvm-project/pull/156567