[PATCH] D13220: Optimize DeadCodeEliminationPass

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This pass is currently doing an O(N) search of a vector on each iteration; let's rewrite it to work the same way as simplifyInstructionsInBlock.

Repository:
  rL LLVM

http://reviews.llvm.org/D13220

Files:
  lib/Transforms/Scalar/DCE.cpp

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