[PATCH] LICM: Don't crash when an instruction is used by an unreachable BB

[David Majnemer]

Closed by commit rL216911 (authored by @majnemer).

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D5146

Files:
  llvm/trunk/lib/Transforms/Scalar/LICM.cpp
  llvm/trunk/test/Transforms/LICM/PR19798.ll
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