This does not lgtm. It is very unintuitive why Double vs. Int32
representation
would have anything to do with whether operands are better swapped or not.
Probably this benchmark just happens to create a situation where our
heuristic
makes the wrong decision. Maybe Better{Left,Right}Operand() should be made
smarter? Changing behavior based on representation does not seem right.
https://codereview.chromium.org/23717039/
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