https://bugs.webkit.org/show_bug.cgi?id=99958

Reviewed by Alexander Pavlov.

Source/WTF:

Make sure memory occupied by objects of classes with multiple inheritance is
not double counted.

* wtf/MemoryInstrumentation.h:
(WTF::MemoryObjectInfo::MemoryObjectInfo):
(WTF::MemoryObjectInfo::reportedPointer):
(WTF::MemoryObjectInfo::reportObjectInfo): 1) Store actual pointer to the instrumented
object as it may differ from the original pointer by which it was reported. 2) Make
the method non-template and calculate object size on the caller side.
(MemoryObjectInfo):
(WTF::MemoryInstrumentation::reportObjectMemoryUsage):
(WTF::MemoryClassInfo::MemoryClassInfo):
(WTF::MemoryInstrumentation::InstrumentedPointer::process): use adjusted pointer
returned by reportMemoryUsage to check if the object has already been visited when
the pointer differs from the orinal one(it may happen if the object was reported
by a pointer to one of its base classes).

Tools:

* TestWebKitAPI/Tests/WTF/MemoryInstrumentationTest.cpp: Test that there
is no double counting in case of multiple inheritance.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@132059 268f45cc-cd09-0410-ab3c-d52691b4dbfc