In https://crrev.com/c/1044187 we messed up the macro definition, so
the four f64 operations with c fallback were actually never emitted (we
bailed out instead). This went unnoticed, as it does not produce an
error.
This CL reenables these four instructions.

R=ahaas@chromium.org
CC=​predrag.rudic@mips.com

Bug: v8:6600, v8:7933
Change-Id: I394a0348237676c12df741fc3f302c4576619ffc
Reviewed-on: https://chromium-review.googlesource.com/1135532Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54426}