RFR: 8251505: Use of types in compiler shared code should be consistent.

[Yi-Fan Tsai]

8251505: Use of types in compiler shared code should be consistent.

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Commit messages:
 - Remove JFR changes
 - Make the type of methodReclaimedCount consistent
 - Minor formatting
 - Use signed integers
 - 8251505: Use of types in compiler shared code should be consistent.

Changes: https://git.openjdk.java.net/jdk/pull/7294/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7294&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8251505
  Stats: 33 lines in 9 files changed: 2 ins; 0 del; 31 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7294.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7294/head:pull/7294

PR: https://git.openjdk.java.net/jdk/pull/7294