bundle xorps and cvtsi2sd into a MacroAssembler. Currently use it
everywhere.
There is not any performance regression compared with patch set 1 and has
the
same benefit.
Currently This bundle is used everywhere temporary. If we find there is any
performance issue on some scenarios, we can change it back.
I will port it to X64 backend.
https://codereview.chromium.org/23654026/
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