https://crrev.com/c/1343709 fixed GetIncumbentContext to work
with ASan, however, GetIncumbentContext didn't work well with
MSan because MSan uses a simulator which supports yet another
separate stack frame.

This patch fixes GetIncumbentContext so that it works well
with not only ASan but also MSan simply following the same way
as v8::TryCatch does.

i::GetCurrentStackPosition() solves the issue of ASan and
SafeStack (native but separate stack frame), and
i::SimulatorStack solves the issue of MSan (simulator stack
frame).

Bug: chromium:888867, chromium:866610
Change-Id: Id803cbfd17fb1b1d9b8ee34c4802768f3a2f8e79
Reviewed-on: https://chromium-review.googlesource.com/c/1356691
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58096}