This removes the heuristic from {JSStackFrame::IsConstructor} that tried
to infer whether a frame was called as a constructor or not from the
receiver value. We are now carrying along the appropriate bit derived
from the frame type instead.

R=jgruber@chromium.org
TEST=message/regress/regress-5727
BUG=v8:5727

Change-Id: I0e2f1d0f95485c84c4ebcd3cbfe0123c6afd2e01
Reviewed-on: https://chromium-review.googlesource.com/500313
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45972}