This allows f32 floor, ceil, trunc, and nearest_int to use a C fallback in
Liftoff in the same way that f64 rounding can.

Bug: v8:6600
Change-Id: I8b88d806633bcfe2d2dfac9defaf60e551bf21b1
Reviewed-on: https://chromium-review.googlesource.com/c/1353898
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57909}