[PATCH] Protection against stack-based memory corruption errors using SafeStack: Clang command line option and function attribute

[Peter Collingbourne]

- Move safestack driver code to collectSanitizerRuntimes; eliminate SSPSafeStack
- Revert unnecessary change
- Update tests for new flags
- Revert changes to AttributeReference.rst (updated automatically)


http://reviews.llvm.org/D6095

Files:
  docs/LanguageExtensions.rst
  docs/SafeStack.rst
  docs/UsersManual.rst
  include/clang/Basic/Attr.td
  include/clang/Basic/AttrDocs.td
  include/clang/Basic/Builtins.def
  include/clang/Basic/LangOptions.def
  include/clang/Basic/Sanitizers.def
  include/clang/Driver/SanitizerArgs.h
  lib/CodeGen/CodeGenModule.cpp
  lib/Driver/Tools.cpp
  lib/Lex/PPMacroExpansion.cpp
  lib/Sema/SemaDeclAttr.cpp
  test/CodeGen/safestack-attr.cpp
  test/CodeGen/stack-protector.c
  test/Driver/fsanitize.c
  test/SemaCXX/attr-no-safestack.cpp

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