[PATCH] Add missing dereferenceable_or_null getters

[Artur Pilipenko]

Hi sanjoy,

Add missing dereferenceable_or_null getters required for http://reviews.llvm.org/D9253 change. Separated from the D9253 review.

http://reviews.llvm.org/D9499

Files:
  include/llvm/IR/Argument.h
  include/llvm/IR/CallSite.h
  include/llvm/IR/Function.h
  include/llvm/IR/Instructions.h
  lib/IR/AttributeImpl.h
  lib/IR/Attributes.cpp
  lib/IR/Function.cpp

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