The wasm instance is not needed after calling the wasm function.

Bug: v8:10701
Change-Id: I9b53ecba74873746ee9c163011bca0167969c6c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2362691Reviewed-by: Andreas Haas <ahaas@chromium.org>
Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Eva Herencsárová <evih@google.com>
Cr-Commit-Position: refs/heads/master@{#69454}