If a {NativeModule} dies while a GC is running, we could leave behind
references to code of that deleted module. This CL fixes that.
This issue was found by running with --stress-wasm-code-gc.

R=mstarzinger@chromium.org

Bug: v8:8217
Change-Id: I7f0d98977e6510899170306952936c4a7f7d3c10
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1585722Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61041}