[PATCH] Ephemeral values for LLVM invariants

[hfinkel at anl.gov]

Addressed some review comments (others are no longer relevant because we only look at @llvm.assume via the AssumptionTracker). Thanks!

http://reviews.llvm.org/D180

Files:
  include/llvm/Analysis/CodeMetrics.h
  include/llvm/Analysis/InlineCost.h
  lib/Analysis/CodeMetrics.cpp
  lib/Analysis/IPA/InlineCost.cpp
  lib/Transforms/Scalar/LoopRotation.cpp
  lib/Transforms/Scalar/LoopUnrollPass.cpp
  lib/Transforms/Scalar/LoopUnswitch.cpp
  test/Transforms/Inline/ephemeral.ll
  test/Transforms/LoopUnroll/ephemeral.ll
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