[PATCH] Downgrade 'optnone' attribute conflicts to warning

[Paul Robinson]

Hi aaron.ballman,

When attribute 'optnone' appears on the same declaration with a
conflicting attribute, warn about the conflict and pick a "winning"
attribute to preserve, instead of emitting an error.  This matches the
behavior when the conflicting attributes are on different declarations.

Along the way I discovered that conflicts involving __forceinline were
reported as 'always_inline' (alternate spellings for the same
attribute) so I hacked in a way to provide the spelling used in the
declaration. There must be a better way, though...

http://reviews.llvm.org/D6933

Files:
  include/clang/Sema/Sema.h
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaDeclAttr.cpp
  test/SemaCXX/attr-optnone.cpp

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