Invoking a JSBoundFunction is slightly slower than a normal
JSFunction (since we don't have to first jump to the
target_function).

The closure steps in SourceTextModule ExecuteAsyncModule is
controlled by the engine so it is better to create dedicated
context slots for the captured values.

Change-Id: I8163fc4b302d6d22906e578164470c9e28e768e0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3584601Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Chengzhong Wu <legendecas@gmail.com>
Cr-Commit-Position: refs/heads/main@{#80155}