RFR: 8264872: Dependencies: Migrate to PerfData counters

[Vladimir Ivanov]

Migrate performance counters on `Dependencies` (`deps_find_witness_*`) to `PerfData`.

Testing:
- [x] hs-tier1 - hs-tier2

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Depends on: https://git.openjdk.java.net/jdk/pull/3385

Commit messages:
 - CountingClassHierarchyIterator
 - Migrate to PerfData
 - Depenencies perf counters

Changes: https://git.openjdk.java.net/jdk/pull/3386/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3386&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264872
  Stats: 121 lines in 4 files changed: 61 ins; 37 del; 23 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3386.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3386/head:pull/3386

PR: https://git.openjdk.java.net/jdk/pull/3386