RFR: 8291970: Add TableStatistics get function to ResourceHashtable

[Calvin Cheung]

On Fri, 5 Aug 2022 14:47:39 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> Add a statistics_calculate function to ResourceHashtable so that we can use it for printing.  Also add a test.
> Tested with tier1 on Oracle platforms (with and without product build).

Looks good.

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Marked as reviewed by ccheung (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9775