[turbofan] Do constant folding for Float64Pow.
Also unify the Pow implementation somewhat. There are still some inconsistencies with the FPU version for x64/ia32, but that has to be resolved separately. R=ahaas@chromium.org, mvstanton@chromium.org BUG=v8:5086 Review-Url: https://codereview.chromium.org/2333663002 Cr-Commit-Position: refs/heads/master@{#39368}
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