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

[Daniel Sanders]

Bring this patch into line with the overall way David solved the issue with int
not being a promotable integer. That is, promote the Clang type rather than
promote the LLVM IR type.

There's a still a couple differences compared to the original patches this is
based on:
* intptr_t/uintptr_t is 32-bit for N32 so we explicitly ask for a 64-bit integer
  type.
* We only promote if the integer type is smaller than the one we promote to.
  This prevents accidental demotion of 128-bit ints.

http://reviews.llvm.org/D6248

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