[PATCH] `nonnull` argument attribute.

[Luqman Aden]

This patch adds a new argument attribute `non null`. This lets LLVM get rid of certain null checks. GCC already has a nonnull attribute. Also, this would be useful in Rust since we can mark a lot of our pointers as such.

http://reviews.llvm.org/D3389

Files:
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/IR/Function.cpp
  lib/IR/Attributes.cpp
  lib/Analysis/ValueTracking.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLToken.h
  test/Bitcode/attributes.ll
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/Attributes.h
  include/llvm/IR/Argument.h
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