[PATCH] Unify clang/llvm attributes for asan/tsan/msan (Clang part)

[Kostya Serebryany]

Hi chandlerc, samsonov,

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

http://llvm-reviews.chandlerc.com/D449

Files:
  test/CodeGenObjCXX/address-safety-attr.mm
  test/CodeGen/address-safety-attr.cpp
  test/CodeGen/sanitize-thread-attr.cpp
  test/SemaCXX/attr-no-sanitize-address.cpp
  test/SemaCXX/attr-no-sanitize-thread.cpp
  test/SemaCXX/attr-no-sanitize-memory.cpp
  include/clang/Basic/Attr.td
  docs/MemorySanitizer.rst
  docs/LanguageExtensions.rst
  docs/AddressSanitizer.rst
  docs/ThreadSanitizer.rst
  lib/CodeGen/CGDeclCXX.cpp
  lib/CodeGen/CodeGenModule.cpp
  lib/Sema/SemaDeclAttr.cpp
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