Reviewers: jarin,

Description:
[turbofan] Add proper conversion operators for int32<->int64.

This affects arm64 and x64. Note that we do not yet optimize
these conversions. Later we will add support for merging these
conversion operators into other operations during instruction
selection.

TEST=cctest,compiler-unittests
[email protected]

Please review this at https://codereview.chromium.org/487723002/

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

Affected files (+324, -87 lines):
  M src/compiler/arm64/code-generator-arm64.cc
  M src/compiler/arm64/instruction-codes-arm64.h
  M src/compiler/arm64/instruction-selector-arm64.cc
  M src/compiler/change-lowering.cc
  M src/compiler/instruction-selector.cc
  M src/compiler/machine-node-factory.h
  M src/compiler/machine-operator.h
  M src/compiler/opcodes.h
  M src/compiler/operator-properties-inl.h
  M src/compiler/simplified-lowering.cc
  M src/compiler/x64/code-generator-x64.cc
  M src/compiler/x64/instruction-codes-x64.h
  M src/compiler/x64/instruction-selector-x64.cc
  M test/cctest/compiler/test-run-machops.cc
  M test/compiler-unittests/arm64/instruction-selector-arm64-unittest.cc
  M test/compiler-unittests/change-lowering-unittest.cc
  M test/compiler-unittests/compiler-unittests.h
  M test/compiler-unittests/compiler-unittests.gyp
  M test/compiler-unittests/graph-unittest.h
  M test/compiler-unittests/graph-unittest.cc
  A test/compiler-unittests/machine-operator-unittest.cc
  A test/compiler-unittests/x64/instruction-selector-x64-unittest.cc


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