[clang] [Headers][X86] Enable constexpr handling for MMX/SSE/AVX/AVX512 avg intrinsics (PR #157464)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h,c -- clang/lib/AST/ByteCode/InterpBuiltin.cpp clang/lib/AST/ExprConstant.cpp clang/lib/Headers/avx2intrin.h clang/lib/Headers/avx512bwintrin.h clang/lib/Headers/avx512vlbwintrin.h clang/lib/Headers/emmintrin.h clang/lib/Headers/xmmintrin.h clang/test/CodeGen/X86/avx2-builtins.c clang/test/CodeGen/X86/avx512bw-builtins.c clang/test/CodeGen/X86/avx512vlbw-builtins.c clang/test/CodeGen/X86/mmx-builtins.c clang/test/CodeGen/X86/sse2-builtins.c
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``````````diff
diff --git a/clang/lib/Headers/xmmintrin.h b/clang/lib/Headers/xmmintrin.h
index 9e5d97ebf..6b70f245e 100644
--- a/clang/lib/Headers/xmmintrin.h
+++ b/clang/lib/Headers/xmmintrin.h
@@ -2561,8 +2561,8 @@ _mm_avg_pu8(__m64 __a, __m64 __b) {
 /// \returns A 64-bit integer vector containing the averages of both operands.
 static __inline__ __m64 __DEFAULT_FN_ATTRS_SSE2_CONSTEXPR
 _mm_avg_pu16(__m64 __a, __m64 __b) {
-  return __trunc64(__builtin_ia32_pavgw128((__v8hu)__zext128(__a),
-                                           (__v8hu)__zext128(__b)));
+  return __trunc64(
+      __builtin_ia32_pavgw128((__v8hu)__zext128(__a), (__v8hu)__zext128(__b)));
 }
 
 /// Subtracts the corresponding 8-bit unsigned integer values of the two

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https://github.com/llvm/llvm-project/pull/157464