Request for review: 7174978: NPG: Fix bactrace builder for class redefinition

[Vitaly Davidovich]

Hi Coleen,

Along the same lines, is it OK to omit a fence in do_unloading after
storing into _backtraces_head? Not sure if safepoint means no other VM
thread can poke around concurrently here, but thought I'd ask just in case.

Thanks

Sent from my phone
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