RFR: 8292375: Convert ProtectionDomainCacheTable to ResourceHashtable [v7]

[Coleen Phillimore]

> Please review this simple conversion for the ProtectionDomainCacheTable from Old Hashtable to ResourceHashtable.  There are specific tests for this table in test/hotspot/jtreg/runtime/Dictionary and serviceability/dcmd/vm/DictionaryStatsTest.java.
> Also tested with tier1-7.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Fix comments, add assert.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/10043/files
  - new: https://git.openjdk.org/jdk/pull/10043/files/3634521f..8bdc90e1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10043&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10043&range=05-06

  Stats: 4 lines in 1 file changed: 2 ins; 1 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/10043.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10043/head:pull/10043

PR: https://git.openjdk.org/jdk/pull/10043