[clang] [Clang][X86] Add avx512 __builtin_ia32_select* constexpr handling (PR #152705)

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


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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions h,cpp,c -- clang/lib/AST/ExprConstant.cpp clang/lib/Headers/avx512fintrin.h clang/lib/Headers/avx512vpopcntdqintrin.h clang/lib/Headers/avx512vpopcntdqvlintrin.h clang/test/CodeGen/X86/avx512f-builtins.c clang/test/CodeGen/X86/avx512vpopcntdq-builtins.c clang/test/CodeGen/X86/avx512vpopcntdqvl-builtins.c
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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 c1f61e76e..7c5d06da2 100644
--- a/clang/lib/Headers/avx512fintrin.h
+++ b/clang/lib/Headers/avx512fintrin.h
@@ -8963,16 +8963,14 @@ _mm512_mask_cvtpslo_pd (__m512d __W, __mmask8 __U, __m512 __A)
 }
 
 static __inline__ __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_mask_mov_pd (__m512d __W, __mmask8 __U, __m512d __A)
-{
+_mm512_mask_mov_pd(__m512d __W, __mmask8 __U, __m512d __A) {
   return (__m512d) __builtin_ia32_selectpd_512 ((__mmask8) __U,
               (__v8df) __A,
               (__v8df) __W);
 }
 
 static __inline__ __m512d __DEFAULT_FN_ATTRS512_CONSTEXPR
-_mm512_maskz_mov_pd (__mmask8 __U, __m512d __A)
-{
+_mm512_maskz_mov_pd(__mmask8 __U, __m512d __A) {
   return (__m512d) __builtin_ia32_selectpd_512 ((__mmask8) __U,
               (__v8df) __A,
               (__v8df) _mm512_setzero_pd ());
diff --git a/clang/lib/Headers/avx512vpopcntdqintrin.h b/clang/lib/Headers/avx512vpopcntdqintrin.h
index 7bf0700da..ac71808f6 100644
--- a/clang/lib/Headers/avx512vpopcntdqintrin.h
+++ b/clang/lib/Headers/avx512vpopcntdqintrin.h
@@ -28,8 +28,7 @@
                  __min_vector_width__(512)))
 #endif
 
-static __inline__ __m512i __DEFAULT_FN_ATTRS
-_mm512_popcnt_epi64(__m512i __A) {
+static __inline__ __m512i __DEFAULT_FN_ATTRS _mm512_popcnt_epi64(__m512i __A) {
   return (__m512i)__builtin_elementwise_popcount((__v8du)__A);
 }
 
@@ -44,8 +43,7 @@ _mm512_maskz_popcnt_epi64(__mmask8 __U, __m512i __A) {
   return _mm512_mask_popcnt_epi64((__m512i)_mm512_setzero_si512(), __U, __A);
 }
 
-static __inline__ __m512i __DEFAULT_FN_ATTRS
-_mm512_popcnt_epi32(__m512i __A) {
+static __inline__ __m512i __DEFAULT_FN_ATTRS _mm512_popcnt_epi32(__m512i __A) {
   return (__m512i)__builtin_elementwise_popcount((__v16su)__A);
 }
 
diff --git a/clang/lib/Headers/avx512vpopcntdqvlintrin.h b/clang/lib/Headers/avx512vpopcntdqvlintrin.h
index deb849f95..bed951b76 100644
--- a/clang/lib/Headers/avx512vpopcntdqvlintrin.h
+++ b/clang/lib/Headers/avx512vpopcntdqvlintrin.h
@@ -37,8 +37,7 @@
                  __min_vector_width__(256)))
 #endif
 
-static __inline__ __m128i __DEFAULT_FN_ATTRS128
-_mm_popcnt_epi64(__m128i __A) {
+static __inline__ __m128i __DEFAULT_FN_ATTRS128 _mm_popcnt_epi64(__m128i __A) {
   return (__m128i)__builtin_elementwise_popcount((__v2du)__A);
 }
 
@@ -53,8 +52,7 @@ _mm_maskz_popcnt_epi64(__mmask8 __U, __m128i __A) {
   return _mm_mask_popcnt_epi64((__m128i)_mm_setzero_si128(), __U, __A);
 }
 
-static __inline__ __m128i __DEFAULT_FN_ATTRS128
-_mm_popcnt_epi32(__m128i __A) {
+static __inline__ __m128i __DEFAULT_FN_ATTRS128 _mm_popcnt_epi32(__m128i __A) {
   return (__m128i)__builtin_elementwise_popcount((__v4su)__A);
 }
 

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https://github.com/llvm/llvm-project/pull/152705