[clang] [Headers][X86] Allow AVX1 fixed extraction intrinsics to be used in constexpr (PR #161218)

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

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Headers/avxintrin.h b/clang/lib/Headers/avxintrin.h
index 65588f333..d6ba19a6c 100644
--- a/clang/lib/Headers/avxintrin.h
+++ b/clang/lib/Headers/avxintrin.h
@@ -2312,9 +2312,8 @@ _mm256_cvttps_epi32(__m256 __a)
 ///    A 256-bit vector of [4 x double].
 /// \returns A 64 bit double containing the first element of the input vector.
 static __inline double __DEFAULT_FN_ATTRS_CONSTEXPR
-_mm256_cvtsd_f64(__m256d __a)
-{
- return __a[0];
+_mm256_cvtsd_f64(__m256d __a) {
+  return __a[0];
 }
 
 /// Returns the first element of the input vector of [8 x i32].
@@ -2328,10 +2327,9 @@ _mm256_cvtsd_f64(__m256d __a)
 ///    A 256-bit vector of [8 x i32].
 /// \returns A 32 bit integer containing the first element of the input vector.
 static __inline int __DEFAULT_FN_ATTRS_CONSTEXPR
-_mm256_cvtsi256_si32(__m256i __a)
-{
- __v8si __b = (__v8si)__a;
- return __b[0];
+_mm256_cvtsi256_si32(__m256i __a) {
+  __v8si __b = (__v8si)__a;
+  return __b[0];
 }
 
 /// Returns the first element of the input vector of [8 x float].
@@ -2345,9 +2343,8 @@ _mm256_cvtsi256_si32(__m256i __a)
 ///    A 256-bit vector of [8 x float].
 /// \returns A 32 bit float containing the first element of the input vector.
 static __inline float __DEFAULT_FN_ATTRS_CONSTEXPR
-_mm256_cvtss_f32(__m256 __a)
-{
- return __a[0];
+_mm256_cvtss_f32(__m256 __a) {
+  return __a[0];
 }
 
 /* Vector replicate */

``````````

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https://github.com/llvm/llvm-project/pull/161218