This reverts commit d5e63b03.

Reason for revert: Fails gc-stress: https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Mac64%20GC%20Stress/5312

Original change's description:
> Reland "[GC] Ensure JSFunctions with flushed bytecode are flushed during GC."
> 
> This is a reland of f5729f1c
> 
> TBR=ulan@chromium.org
> 
> Original change's description:
> > [GC] Ensure JSFunctions with flushed bytecode are flushed during GC.
> >
> > When bytecode is flushed from a SFI, the JSFunctions still retain their
> > FeedbackVector's and point to the interpreter entry trampoline. They are
> > reset if re-executed, however if not they could hold onto the feedback
> > vector indefinetly. This CL adds a pass the GC to detect JSFunctions that
> > need to be reset, and performs the reset at the end of GC.
> >
> > BUG=v8:8395
> >
> > Change-Id: I3de8655aff9ff80f912b4fd51dee43eb98cfd519
> > Reviewed-on: https://chromium-review.googlesource.com/c/1393292
> > Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
> > Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#58775}
> 
> Bug: v8:8395
> Change-Id: I9bc84b62332575a080561c51f08b699b91e41e4a
> Reviewed-on: https://chromium-review.googlesource.com/c/1414859
> Commit-Queue: Ross McIlroy <rmcilroy@chromium.org>
> Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
> Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58924}

TBR=ulan@chromium.org,rmcilroy@chromium.org

Change-Id: I5d3012d4c7277ae792b0488780ff426d51dd602f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8395
Reviewed-on: https://chromium-review.googlesource.com/c/1421838Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58925}