Reviewers: titzer,

Message:
PTAL

Description:
[turbofan] Add operators for float32 support.

This adds Float32Constant, ChangeFloat32ToFloat64 and
TruncateFloat64ToFloat32 operators.

TEST=compiler-unittests
BUG=v8:3589
LOG=n

Please review this at https://codereview.chromium.org/594493002/

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

Affected files (+153, -95 lines):
  M src/compiler/common-operator.h
  M src/compiler/common-operator.cc
  M src/compiler/common-operator-unittest.cc
  M src/compiler/machine-operator.h
  M src/compiler/machine-operator.cc
  M src/compiler/machine-operator-reducer.cc
  M src/compiler/machine-operator-reducer-unittest.cc
  M src/compiler/machine-operator-unittest.cc
  M src/compiler/opcodes.h
  M src/compiler/typer.cc


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