RFR: 8304996: Add missing Handlemarks

[David Holmes]

The review for [JDK-8304147](https://bugs.openjdk.org/browse/JDK-8304147) pointed out that the top-level HandleMark in dump_for_exit (added to replace the previous coverage from a HandleMarkCleaner in JVM_ENTRY) was not in the right place as no Handles were being used there. Removing that HM and fixing up the ensuing failures led to a set of fixes where HM's were missing at the place of Handle usage.

Testing: tiers 1-4

Thanks.

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Commit messages:
 - Fix up HandleMarks

Changes: https://git.openjdk.org/jdk/pull/13215/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13215&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8304996
  Stats: 13 lines in 4 files changed: 10 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13215.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13215/head:pull/13215

PR: https://git.openjdk.org/jdk/pull/13215