When updating the native module cache, the native module must have been
created in the same engine before. Hence replace a conditional by a
DCHECK, and add two more DCHECKs to ensure that all involved modules
belong to the same engine.

R=thibaudm@chromium.org

Bug: v8:6847
Change-Id: Ieb66b6b0bda40cd3c4637d38918762bc01c3a2d5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2182640Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67597}