[PATCH, i386] Fix -mpreferred-stack-boundary

[Bernd Edlinger]

Currently on trunk the option -mpreferred-stack-boundary does not work
together with #pragma GCC target("sse") or __attribute__((target("sse"))).

There is already a test case that detects this: gcc.target/i386/fastcall-sseregparm.c

The attached patch fixes this test case under i686-pc-linux-gnu.

Boot-strapped and regression-tested under i686-pc-linux-gnu.

OK for trunk?

Regards
Bernd. 		 	   		  
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