Describe the bug
A large object doesnt show up under "Dominators by retailed size" due to retained size calculation error.
IBM MAT tool doesn't have this problem

To Reproduce
I haven't found a way to generate a heapdump that causes visualvm to behave this way

Expected behavior
visualvm must be able to calculate the retainedsizes

VisualVM log
messages.log

Screenshots
This is how it looks in visualvm

And this is the same object in IBM MAT

And because of the negative retained size calulation, ( i think) the DefaultTable object doesn't show as a Dominator

Desktop (please complete the following information):

• OS: Windows10
• JDK version - jdk-9.0.4
• Version - 2.0.5

Additional context
Add any other context about the problem here.