[PATCH] D153576: [Headers] Fix up some conditionals

[Paul Robinson via Phabricator via cfe-commits]

probinson added a comment.

The Intel documentation <https://www.intel.com/content/www/us/en/docs/intrinsics-guide/index.html#ig_expand=4829,4830,5345,4829,4830&text=mulx> doesn't hint that `_mulx_32` isn't available in 64-bit mode. I'm guessing gcc messed up and we copied them.


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  https://reviews.llvm.org/D153576/new/

https://reviews.llvm.org/D153576