[clang] [Headers][X86] Enable constexpr handling for MMX/SSE/AVX/AVX512 PMADDWD/PMADDUBSW intrinsics (PR #161563)

[Simon Pilgrim via cfe-commits]

https://github.com/RKSimon auto_merge_enabled 
https://github.com/llvm/llvm-project/pull/161563
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