RFR: 8333226: Regressions 2-3% in Compress ZGC after 8331253

[Vladimir Kozlov]

Revert [JDK-8331253](https://bugs.openjdk.org/browse/JDK-8331253) changes [#3383ad63](https://git.openjdk.org/jdk/commit/3383ad6397d5a2d8fb232ffd3e29a54e0b37b686) to avoid regression.
And convert `nmethod::_skipped_instructions_size field` field to `int` type to address original JDK-8331253 issue.

Tested tier1-3,stress,xcomp and performance.

Note: You may see some regressions, but performance returns to state before  JDK-8331253. I may look again in a future on changes I did to calculated skipped instructions.

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Commit messages:
 - 8333226: Regressions 2-3% in Compress ZGC after 8331253

Changes: https://git.openjdk.org/jdk/pull/19531/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19531&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8333226
  Stats: 43 lines in 9 files changed: 6 ins; 24 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/19531.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19531/head:pull/19531

PR: https://git.openjdk.org/jdk/pull/19531