[PATCH] [X86] ABI breaking change for x86-32: pass 3 vector arguments in-register instead of 4, except on Darwin

[Ed Maste]

I didn't spot this when first posted, but I'll belatedly add that I think this is the right change for FreeBSD as well.

Clang has been our system compiler for quite some time but a reasonable portion of the ports tree is built with GCC, and interop and psABI conformance concerns probably override a potential slightly bumpy transition.


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http://reviews.llvm.org/D9644

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