[PATCH] D17567: [GCC] Sema part of attrbute abi_tag support

[Dmitry Polukhin via cfe-commits]

DmitryPolukhin created this revision.
DmitryPolukhin added a reviewer: aaron.ballman.
DmitryPolukhin added subscribers: cfe-commits, stbuehler.

Original patch by Stefan Bühler http://reviews.llvm.org/D12834

Difference between original and this one:
- fixed all comments in original code review
- added more tests, all new diagnostics now covered by tests
- moved abi_tag on re-declaration checks to Sema::mergeDeclAttributes where they actually may work as designed
- clang-format + other stylistic changes

Mangle part will be sent for review as a separate patch.

http://reviews.llvm.org/D17567

Files:
  docs/ItaniumMangleAbiTags.rst
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/DiagnosticSemaKinds.td
  include/clang/Sema/AttributeList.h
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaDeclAttr.cpp
  test/SemaCXX/attr-abi-tag-syntax.cpp

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