During regexp execution we usually do not expect any interrupts to
exist. This optimization doubles Octane/RegExp scores with
--regexp-interpret-all.

Drive-by: Do the same for irregexp stack checks (only applicable when
called through the runtime).
Drive-by: Slightly more specific AllowHeapAllocation scopes.

Bug: v8:7777, v8:9328, v8:9330
Change-Id: I502d54d49a1267dee4b8a086dc6c2dca318a2d97
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1645313
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62000}