This CL adds a stack check to the TFS builtin "FlattenIntoArray" as it
is called recursively and can cause a SEGV with a large enough
"depth" argument.

R=jgruber@chromium.org

Bug: v8:8708
Change-Id: I833506531bcff1c4703b9a21678028cf0e63638d
Reviewed-on: https://chromium-review.googlesource.com/c/1424858
Commit-Queue: Simon Zünd <szuend@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58952}