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Fix potential deadlock in ArrayHandle::PrepareForOutput

Kenneth Moreland requested to merge kmorel/vtk-m:fix-allocate-token-deadlock into master

ArrayHandle::PrepareForOutput often has to reallocate the array to the specified size. Previously, this allocation was not happening with the Token that is passed to PrepareForOutput. If the ArrayHandle is already attached or enqueued for that Token, then the allocation would deadlock.

You can now pass a Token object to Allocate, which is what PrepareForOutput does.

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