[PATCH] [MIPS] fix extension of integer types (function calls)

[Strahinja Petrovic]

There are two solutions for i32 signext problem. First,  i32 argument pass directly (in that case i32 will be sign extended) this fix is in MIPS part. 
 Second solution is fix in common code as I mentioned (CGCall.cpp file, ConstructAttributeList function). This would required new hook in TargetInfo. I think first solution is better for this problem.


http://reviews.llvm.org/D9198

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