[PATCH] Support the assume_aligned function attribute

[hfinkel at anl.gov]

Hi rsmith, aaron.ballman,

In addition to __builtin_assume_aligned, GCC also supports an assume_aligned attribute which specifies the alignment (and optional offset) of the function's return value. Building on the llvm.assume patches, and also functionality added in http://reviews.llvm.org/D149, this patch implements support for the assume_aligned attribute in Clang.

http://reviews.llvm.org/D4601

Files:
  include/clang/Basic/Attr.td
  lib/CodeGen/CGExpr.cpp
  lib/Sema/SemaDeclAttr.cpp
  test/CodeGen/builtin-assume-aligned.c
  test/Sema/builtin-assume-aligned.c
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