[turbofan] Distinguish between change- and truncate-tagged-to-float64.
This prevents the compiler from optimizing f64-to-tagged(tagged-to-f64(x)) ==> x for non-number x (such as undefined). Review-Url: https://codereview.chromium.org/2027593002 Cr-Commit-Position: refs/heads/master@{#36613}
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