Simulator needs a way to check if a fp input is
a signalling NaN and `issignaling` doesn't seem to be
supported on the latest gclient update and causes link errors.

Change-Id: Id2a7200b6cf13bb6174b052728fc5a0d5436321c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3581768Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/main@{#79929}