The JSFunction::set_context call happens 1. only on script functions
and 2. before the function is executed, and therefore the compiler
only ever sees the final value.

Bug: v8:7790
Change-Id: I618673c7ec6284dcf3d80b1edd7be516b048ed2c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3041664
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Auto-Submit: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75833}