RFR: 8272160: Avoid using 32-bit counters in CDS code [v2]

[Matias Saavedra Silva]

> There are a handful of counters in CDS code that are `int` when it would be safer to use size_t. While exploring this I discovered that the `_count` field in DumpTimeKlassSubGraphInfoTable is unused so it is removed and the one use case replaced with a more accurate value. Verified with tier1-5 tests.

Matias Saavedra Silva has updated the pull request incrementally with two additional commits since the last revision:

 - Ioi comments
 - Changes more counters and sizes to size_t

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Changes:
  - all: https://git.openjdk.org/jdk/pull/28139/files
  - new: https://git.openjdk.org/jdk/pull/28139/files/26b7b378..d7e054ff

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28139&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28139&range=00-01

  Stats: 32 lines in 7 files changed: 0 ins; 0 del; 32 mod
  Patch: https://git.openjdk.org/jdk/pull/28139.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28139/head:pull/28139

PR: https://git.openjdk.org/jdk/pull/28139