RFR: 8264872: Dependencies: Migrate to PerfData counters

[Vladimir Kozlov]

On Wed, 7 Apr 2021 22:07:18 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Migrate performance counters on `Dependencies` (`deps_find_witness_*`) to `PerfData`.
> 
> Testing:
> - [x] hs-tier1 - hs-tier2

Good.

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Marked as reviewed by kvn (Reviewer).

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