RFR: 8292448: Convert BitMapFragmentTable to ResourceHashtable

[Coleen Phillimore]

This is an uncomplicated conversion of the bitmap fragment table into a ResizeableResourceHashtable.  Ran tiers 1-3 and 4-7 with other changes, and verified that the memory for ResourceHashtableStorage is freed.

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Commit messages:
 - 8292448: Convert BitMapFragmentTable to ResourceHashtable

Changes: https://git.openjdk.org/jdk/pull/9893/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9893&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292448
  Stats: 85 lines in 2 files changed: 1 ins; 65 del; 19 mod
  Patch: https://git.openjdk.org/jdk/pull/9893.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9893/head:pull/9893

PR: https://git.openjdk.org/jdk/pull/9893