[PATCH] Reject bitcasts between address spaces with different sizes

[Matt Arsenault]

  Handle constant uses in GlobalValues. Still uses DataLayout and compares pointer sizes instead of just the address space.

Hi eli.friedman,

http://llvm-reviews.chandlerc.com/D1083

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1083?vs=2661&id=2671#toc

Files:
  docs/LangRef.rst
  include/llvm/AutoUpgrade.h
  lib/AsmParser/LLParser.cpp
  lib/Bitcode/Reader/BitcodeReader.cpp
  lib/IR/AutoUpgrade.cpp
  lib/IR/Verifier.cpp
  test/Bitcode/bitcast-address-space-nested-global-cycle.ll
  test/Bitcode/bitcast-address-space-nested-global.ll
  test/Bitcode/bitcast-upgrade.ll
  test/Bitcode/bitcast.ll
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