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Before this patch, in order to support finalization of classes in a
hierarchy, the base class must have had a destructor declared as virtual.
This hurt sweeping time as the sweeper had to execute finalizers for
classes that didn't really have any finalization logic. The patch adds
support for non-virtual destructors in Oilpan that provides the basis
for reduction of finalizers in the followup CLs.

In the backend the logic remained the same for classes that have either
 - virtual Base::~Base or
 - trivial Base::~Base and trivial Derived::~Derived or
 - Base::FinalizeGarbageCollectedObject.
The new logic is:
 - if all of the conditions above don't satisfy, separate GCInfo entries
   will be created for Derived classes.

Bug: 1015427

Change-Id: I99481f0508d99668558283417a15cdf0bfe1ae6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1866712
Commit-Queue: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707365}