[PATCH] align_value attribute in Clang

[hfinkel at anl.gov]

Alright, after much discussion, I think this is ready.

To quickly recap, there had been some discussion regarding whether or not align_value needed to be part of the type system (so that it would be propagated by template type deduction, for example), after after receiving feedback from Richard, Alexey, et al., we're settled on no. This is not part of the type system, and will only "propagate" through templates, auto, etc. by optimizer deduction after inlining. This seems consistent with Intel's implementation.

Aaron, this new revision should account for all additional points from your last review.

http://reviews.llvm.org/D4635

Files:
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/AttributeList.h
  include/clang/Sema/Sema.h
  lib/CodeGen/CGCall.cpp
  lib/Sema/SemaDeclAttr.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  test/CodeGen/align_value.cpp
  test/Sema/align_value.c
  test/SemaCXX/align_value.cpp
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