[PATCH] Don't constant fold bitcast/ptrtoint/inttoptr combinations without datalayout

[Matt Arsenault]

  Allow folding bitcast -> ptrtoint when the address spaces are the same.

  Fix inline testcase by making it use casts that can still be folded away.

Hi eli.friedman,

http://llvm-reviews.chandlerc.com/D1157

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D1157?vs=2846&id=2932#toc

Files:
  lib/IR/ConstantFold.cpp
  lib/IR/Instructions.cpp
  test/Transforms/Inline/inline_constprop.ll
  unittests/IR/InstructionsTest.cpp
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