[PATCH] Allow EmitVAArg() to promote types and use this to fix some N32/N64 vararg issues for Mips.

[Daniel Sanders]

Hi atanasyan, theraven,

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.

http://reviews.llvm.org/D6248

Files:
  lib/CodeGen/CGExprScalar.cpp
  lib/CodeGen/TargetInfo.cpp
  test/CodeGen/mips-varargs.c
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