8366456: Allow AllocFailStrategy for RBTree

[jdksjolen]

Right now the RBTree forces you to use the intrusive tree if you want fine-grained control of the out-of-memory strategy of the node allocations. We can change this to be a bit more flexible.

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Issue

• JDK-8366456: Allow AllocFailStrategy for RBTree (Enhancement - P4)

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