[clang] [X86] _mm_addsub_pd is not valid for constexpr (PR #167363)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-x86

Author: Simon Pilgrim (RKSimon)

<details>
<summary>Changes</summary>

Typo in #<!-- -->156822

Part of #<!-- -->166814

---
Full diff: https://github.com/llvm/llvm-project/pull/167363.diff


1 Files Affected:

- (modified) clang/lib/Headers/pmmintrin.h (+1-1) 


``````````diff
diff --git a/clang/lib/Headers/pmmintrin.h b/clang/lib/Headers/pmmintrin.h
index 42bd343e326de..6b152bde29fc1 100644
--- a/clang/lib/Headers/pmmintrin.h
+++ b/clang/lib/Headers/pmmintrin.h
@@ -166,7 +166,7 @@ _mm_moveldup_ps(__m128 __a)
 ///    A 128-bit vector of [2 x double] containing the right source operand.
 /// \returns A 128-bit vector of [2 x double] containing the alternating sums
 ///    and differences of both operands.
-static __inline__ __m128d __DEFAULT_FN_ATTRS_CONSTEXPR
+static __inline__ __m128d __DEFAULT_FN_ATTRS
 _mm_addsub_pd(__m128d __a, __m128d __b) {
   return __builtin_ia32_addsubpd((__v2df)__a, (__v2df)__b);
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/167363