Reviewers: dcarney,

Description:
[turbofan] Smartify the GraphReducer.

Don't use the generic algorithm, but instead start going into the
direction of ControlReducer, using a stack plus a revisit queue to
not miss any more possibilities for reductions anymore.

TEST=cctest,unittests
[email protected]

Please review this at https://codereview.chromium.org/726513002/

Base URL: https://chromium.googlesource.com/v8/v8.git@master

Affected files (+216, -57 lines):
  M src/compiler/graph-reducer.h
  M src/compiler/graph-reducer.cc
  M src/compiler/pipeline.cc
  M src/zone-containers.h
  M test/unittests/compiler/graph-reducer-unittest.cc


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