RFR: 8291969: Convert LoaderConstraintsTable to ResourceHashtable [v3]

[Coleen Phillimore]

> This converts the LoaderConstraintTable to ResourceHashtable.  It's a bit different than the other conversions in that the LoaderConstraintEntry has to be restructured to hold all the loader constraints for that class name, since the search key is the class name.  Also, I replaced the raw arrays with GrowableArray, because it's less code.
> Tested with tier1-3, and tier 4-7 previously with other changes.  I also verified code paths with some temporary asserts with existing tests, including jck tests.

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

  Code review comments and suggestions.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9904/files
  - new: https://git.openjdk.org/jdk/pull/9904/files/8029161d..bfd588db

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9904&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9904&range=01-02

  Stats: 21 lines in 1 file changed: 4 ins; 1 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/9904.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9904/head:pull/9904

PR: https://git.openjdk.org/jdk/pull/9904