[Turbofan] Introduce OtherNumberConstant.
With this CL, we devolve all Constants introduced as they are with an object handle into * Range - for integers * Nan * MinusZero * OtherNumberConstant - for doubles * HeapConstant We reduce the amount we have to inspect an object handle during optimization. Also, simplifications result. For example, you never have to check if a Range contains a HeapConstant. BUG= Review-Url: https://codereview.chromium.org/2381523002 Cr-Commit-Position: refs/heads/master@{#40041}
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