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

[Kostya Serebryany]

  Promoted warnings to errors for no_uninitialized_checks and no_address_safety_analysis and added tests

Hi void, eugenis, dvyukov,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D390?vs=940&id=951#toc

Files:
  include/clang/Basic/Attr.td
  docs/MemorySanitizer.rst
  docs/LanguageExtensions.rst
  docs/ThreadSanitizer.rst
  lib/Sema/SemaDeclAttr.cpp
  lib/CodeGen/CGDeclCXX.cpp
  lib/CodeGen/CodeGenModule.cpp
  test/CodeGen/uninitialized-checks-attr.cpp
  test/CodeGen/thread-safety-attr.cpp
  test/SemaCXX/attr-no-uninitialized-checks.cpp
  test/SemaCXX/attr-no-address-safety-analysis.cpp
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