[PATCH] [NVPTX] aligned byte-buffers for vector return types

[Jingyue Wu]

Hi jholewinski,

Fixes PR21100 which is caused by inconsistency between the declared return type
and the expected return type at the call site. The new behavior is consistent
with nvcc and the NVPTXTargetLowering::getPrototype function.

http://reviews.llvm.org/D5612

Files:
  lib/Target/NVPTX/NVPTXISelLowering.cpp
  test/CodeGen/NVPTX/vector-return.ll
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