This is a reland of 1efe6259

Original change's description:
> [snapshot] Clear irregexp code prior to serialization
> 
> Compiled irregexp code should be cleared unless
> FunctionCodeHandling::kKeep is passed.
> 
> Bug: v8:8572
> Change-Id: Icb74cc6e0f39a69f8383b05f1638cf0e3be1807c
> Reviewed-on: https://chromium-review.googlesource.com/c/1373773
> Commit-Queue: Jakob Gruber <jgruber@chromium.org>
> Reviewed-by: Yang Guo <yangguo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58272}

Bug: v8:8572
Change-Id: I2dfe0c1b4419c47fe2a1916c3bc16800a30309c5
Reviewed-on: https://chromium-review.googlesource.com/c/1379937
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58308}