Handling potential overwriting in Concurrent scavenger back out case #6686
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Update Method fixupForwardedSlot return true or false for the condition
to update heap object reference slot(we won't need to update the
reference slot if the reference is not fixed up) in order to avoid
potential reference slot overwriting(concurrent marking) during
Concurrent scavenger back out case.
Signed-off-by: Lin Hu [email protected]