[PATCH] [mips] Correct alignment of vectors passed in varargs for the O32 ABI.

[Daniel Sanders]

Hi atanasyan,

Vectors are normally 16-byte aligned, however the O32 ABI enforces a
maximum alignment of 8-bytes since the base of the stack is 8-byte aligned.
Previously, this was enforced on the caller side, but not on the callee
side.

This fixes the output of OpenCL's printf when given vectors.

http://reviews.llvm.org/D5433

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