TSan and MSan were the only remaining sanitizers referring to the deprecated
attribute for issue suppression. Update the docs to recommend
__attribute__((no_sanitize("..."))) instead.

Differential Revision: https://reviews.llvm.org/D25885

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A number of warnings still remain, but these were the last of the
"unlexable code"-related ones (AFAICT).

I changed a few examples in docs/UsersManual.rst to showcase
-Wextra-tokens because it's already documented (-Wmultichar isn't), and
the sphinx C lexer apparently can't handle char literals like 'ab'. It
seemed like a better overall approach than just marking the code blocks
as none or console.


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Since the attribute documentation is now auto-generated, the previous references
are no longer valid.  This prevented the docs build from completing
successfully.

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This reverts commit r229554.

Reverting this commit for now as several apple internal builds still
rely on this functionality.

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They autotools build has a number of missing features, supports less
OS, architectures, build configurations, doesn't have any tests and
is hard to support in sync with CMake build.

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update docs for no_sanitize_thread attribute and blacklist



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Differential Revision: http://llvm-reviews.chandlerc.com/D502

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These are two related changes (one in llvm, one in clang).
LLVM: 
- rename address_safety => sanitize_address (the enum value is the same, so we preserve binary compatibility with old bitcode)
- rename thread_safety => sanitize_thread
- rename no_uninitialized_checks -> sanitize_memory

CLANG: 
- add __attribute__((no_sanitize_address)) as a synonym for __attribute__((no_address_safety_analysis))
- add __attribute__((no_sanitize_thread))
- add __attribute__((no_sanitize_memory))

for S in address thread memory
If -fsanitize=S is present and __attribute__((no_sanitize_S)) is not
set llvm attribute sanitize_S


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Converts:
    LanguageExtensions
    LibASTMatchers
    LibTooling
    PCHInternals
    ThreadSanitizer
    Tooling

Patch by Mykhailo Pustovit!
(with minor edits by Dmitri Gribenko and Sean Silva)

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