[builtins] Migrate Number.parseFloat to a TurboFan builtin.
This implicitly convers parseFloat on the global object as well, since it's the same function. This is mostly straight-forward, but adds another fast case for HeapNumbers as well. R=ishell@chromium.org Review-Url: https://codereview.chromium.org/2395373002 Cr-Commit-Position: refs/heads/master@{#40072}
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