[aarch64-port-dev ] RFR: Backport: 8217368: AArch64: C2 recursive stack locking optimisation not triggered

[Andrew Haley]

This is Nick Gasson's patch, stripped of the changes that were due
to adaptations made because of later changes to MacroAssembler.

http://cr.openjdk.java.net/~aph/aarch64-jdk8u/8217368.patch

-- 
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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