[turbofan] Weaken a DCHECK to allow tagged numbers as double constants in frame states.
[turbofan] Weaken a DCHECK to allow tagged numbers as double constants in frame states.

BUG=chromium:472078
LOG=n
R=mstarzinger@chromium.org

Review URL: https://codereview.chromium.org/1047173002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#27542}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh