RFR: 8270059: Remove KVHashtable

[Ioi Lam]

There are now only 2 uses of KVHashtable in the HotSpot code. They can be easily rewritten to use ResourceHashtable and ResizeableResourceHashtable.

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Commit messages:
 - 8270059: Remove KVHashtable

Changes: https://git.openjdk.java.net/jdk/pull/4715/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=4715&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8270059
  Stats: 133 lines in 6 files changed: 6 ins; 110 del; 17 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4715.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4715/head:pull/4715

PR: https://git.openjdk.java.net/jdk/pull/4715