Allow EmitVAArg() to promote types and use this to fix some N32/N64 vararg issues for Mips.
With this patch, passing a va_list to another function and reading 10 int's from
it works correctly on a big-endian target.
Based on a pair of patches by David Chisnall, one of which I've reworked
for the current trunk.
Reviewers: theraven, atanasyan
Reviewed By: theraven, atanasyan
Differential Revision: http://reviews.llvm.org/D6248