[PATCH] Add a dereferencable attribute

[hfinkel at anl.gov]

I believe that this should address everyone's suggestions. Notably:

 - We're no longer limited to 12 bits (a full 64-bit unsigned value is accepted). The only downside is that we cannot use this attribute with the bitmask scheme used by older bitcode (and perhaps uses of the older associated C API?), but I don't think this is a major problem.

 - For addrspace(0), this attribute also implies nonnull (so we don't need to have both).

http://reviews.llvm.org/D4449

Files:
  docs/LangRef.rst
  include/llvm-c/Core.h
  include/llvm/Bitcode/LLVMBitCodes.h
  include/llvm/IR/Argument.h
  include/llvm/IR/Attributes.h
  include/llvm/IR/CallSite.h
  include/llvm/IR/Function.h
  include/llvm/IR/Instructions.h
  lib/Analysis/ValueTracking.cpp
  lib/AsmParser/LLLexer.cpp
  lib/AsmParser/LLParser.cpp
  lib/AsmParser/LLParser.h
  lib/AsmParser/LLToken.h
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/Bitcode/Writer/BitcodeWriter.cpp
  lib/IR/AttributeImpl.h
  lib/IR/Attributes.cpp
  lib/IR/Function.cpp
  lib/IR/Value.cpp
  test/Bitcode/attributes.ll
  test/Transforms/InstSimplify/compare.ll
  test/Transforms/LICM/hoist-deref-load.ll
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