[PATCH] add __attribute__ no_uninitialized_checks. Map no_uninitialized_checks/no_thread_safety_analysis to LLVM function attributes.

[Kostya Serebryany]

Hi void, eugenis, dvyukov,

- Adding __attribute__((no_uninitialized_checks))
- Mapping __attribute__((no_uninitialized_checks)) to llvm::Attribute::UninitializedChecks (under MSAN)
- Mapping __attribute__((no_thread_safety_analysis)) llvm::Attribute::ThreadSafety (under TSAN)
- Updating Docs & Tests

http://llvm-reviews.chandlerc.com/D390

Files:
  lib/CodeGen/CodeGenModule.cpp
  lib/CodeGen/CGDeclCXX.cpp
  lib/Sema/SemaDeclAttr.cpp
  test/CodeGen/uninitialized-checks-attr.cpp
  test/CodeGen/thread-safety-attr.cpp
  include/clang/Basic/Attr.td
  docs/MemorySanitizer.rst
  docs/ThreadSanitizer.rst
  docs/LanguageExtensions.rst
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