Reviewers: Michael Starzinger,

Description:
[turbofan] Reenable value numbering.

Value numbering is now limited to eliminatable operators (i.e. operators
that don't throw and don't write), and uses linear probing instead of
separate chaining.

TEST=unittests
[email protected]

Please review this at https://codereview.chromium.org/630423002/

SVN Base: https://v8.googlecode.com/svn/branches/bleeding_edge

Affected files (+108, -38 lines):
  M src/compiler/pipeline.cc
  M src/compiler/value-numbering-reducer.h
  M src/compiler/value-numbering-reducer.cc
  M test/unittests/compiler/value-numbering-reducer-unittest.cc


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