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  1. JDK
  2. JDK-8212992

Change mirror accessor in Klass::verify_on() to use AS_NO_KEEPALIVE

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        The Klass::verify_on() is sometimes called on unloaded klasses. It then reads a dead mirror, without using AS_NO_KEEPALIVE, which can make GC barriers feel like :C. In order to make barriers happy, AS_NO_KEEPALIVE should be used when loading dead oops.

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                eosterlund Erik Österlund
                eosterlund Erik Österlund
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