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This changes the ABI used on 32-bit x86 for passing vector arguments. Historically, clang passes the first 4 vector arguments in-register, and additional vector arguments on the stack, regardless of platform. That is different from the behavior of gcc, icc, and msvc, all of which pass only the first 3 arguments in-register. The 3-register convention is documented, unofficially, in Agner's calling convention guide, and, officially, in the recently released version 1.0 of the i386 psABI. Darwin is kept as is because the OS X ABI Function Call Guide explicitly documents the current (4-register) behavior. This fixes PR21510 Differential revision: http://reviews.llvm.org/D9644 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@237682 91177308-0d34-0410-b5e6-96231b3b80d8
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