patch for pr43869

[Maarten Lankhorst <m dot b dot lankhorst at gmail dot com>]

The bug is improper passing of arguments from a ms_abi to a sysv 
function, because SSE_REGPARMS is equal to X86_64_REGPARMS or 
X86_64_MS_REGPARMS, depending on the abi of the current function.

The testcase is part of the patch, I didn't add a testcase for the 
ms_abi -> sysv varargs case, but it is potentially affected as well, it 
would just be harder to trigger.

I guess a changelog entry would be:

pr43869:
* i386.c: Make sure that the correct regparm is passed.
* testsuite/gcc.c-target/pr43869.c: Add test.

Attachment: pr.txt
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