[PATCH] thread_safety and uninitialized_checks attributes

[Kostya Serebryany]

Hi void,

Adding two new function attributes: thread_safety and uninitialized_checks. 
They will be used by tsan/msan the same way as
address_safety attribute is used by asan.

Also fix Bitcode/Reader/BitcodeReader (and Writer)
to allow attributes above 1ULL<<36

See http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20130204/164388.html for the discussion. 

With later patches I will add the corresponding user attribute __attribute__(uninitialized_checks). 
There is already an existing attribute __attribute__(no_thread_safety_analysis)

Naming is hard. I'd be glad to hear a better alternative for the "uninitialized_checks" attribute name. 


http://llvm-reviews.chandlerc.com/D383

Files:
  utils/llvm.grm
  utils/vim/llvm.vim
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLToken.h
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/IR/Verifier.cpp
  lib/IR/Attributes.cpp
  test/Bitcode/attributes.ll
  include/llvm/IR/Attributes.h
  docs/LangRef.rst
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