Currently, the implementation of Call throws if the property is
non-callable. This CL just updates the torque type signature to reflect
this.

Change-Id: I3f8626ba96f41e6d52564df8d481fba52b05a3fc
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1989572
Commit-Queue: Joshua Litt <joshualitt@chromium.org>
Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#65607}