This reverts commit f5729f1c.

Reason for revert: GC Stress failures, e.g. https://ci.chromium.org/p/v8/builders/luci.v8.ci/V8%20Linux64%20GC%20Stress%20-%20custom%20snapshot/23549

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}

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

Change-Id: I1ba0a190e54bb84b9e2c52ae73d19eb5afc02a4b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:8395
Reviewed-on: https://chromium-review.googlesource.com/c/1408993Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58778}