[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 R=jarin@chromium.org Review URL: https://codereview.chromium.org/487723002 git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23184 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
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