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The View destructor ends up in an impossible state which means that
execution must have branched to the middle of it, but it is not clear
how this could happen. This change adds an array of line numbers that is
filled in as the destructor runs to leave us some bread crumbs. It also
records the vtable of the about-to-be-deleted child object so that we
can investigate if this is a type-related bug.

Bug: 1152152
Change-Id: I386507974a8b6ccd1914e0ec62151456411f0c19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572793
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833875}