[PATCH] Don't Promote x86_fp80 byval Pointer Arguments

[Thomas Jablin]

Hi Reid,
I have prepared a new version of the patch to address your feedback. The patch includes new tests, so arguments are only promoted if they have no padding or if we can prove the padding bytes are not accessed. In either case, it is safe to pass the elements by value without worrying about complications due to padding bytes. I have added a data layout field to the tail.ll test case. On a platform where i32 is 64-bit aligned, the promotion tested by tail.ll is unsound.
Tom

http://reviews.llvm.org/D5057

Files:
  lib/Transforms/IPO/ArgumentPromotion.cpp
  test/Transforms/ArgumentPromotion/fp80.ll
  test/Transforms/ArgumentPromotion/tail.ll
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