[aarch64-port-dev ] ZeroTLAB and block zeroing

[Andrew Haley]

MacroAssembler::tlab_refill() does not call MacroAssembler::zero_words(), so
it does not use DC ZVA.  It certainly could, and perhaps someone could try.
It would remove most of our loops when allocating objects.  It'd be interesting
to see if this helps anything.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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