RFR: 8275445: RunThese30M.java failed "assert(ZAddress::is_marked(addr)) failed: Should be marked"

[Markus Grönlund]

Greetings,

This fixes the issue seen in testing when accessing an oop as part of unloading.

All oop accesses will be done outside of unloading and the result (the codesource) will be cached and reused in the FinalizerEntry.

Testing: in progress

Thanks
Markus

PS one effect of this is that classes that unload before they have allocated anything will not have a codesource attribute. This can be fixed by letting the classes register with the table as part of class loading, instead of during allocation. I will followup with a separate change for that.

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Commit messages:
 - move oop accesses outside of unload

Changes: https://git.openjdk.java.net/jdk/pull/6001/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6001&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8275445
  Stats: 108 lines in 4 files changed: 63 ins; 44 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6001.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6001/head:pull/6001

PR: https://git.openjdk.java.net/jdk/pull/6001