[wasm] Refine installation of the WebAssembly.Exception constructor

Bug: chromium:1219630

Change-Id: Idf187bfb16157074b0affda1db3b8ac0b0870e7a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2964094


Reviewed-by: Jakob Kummerow <jkummerow@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75177}