RFR: 8143041: Unify G1CollectorPolicy::PauseKind and G1YCType

Mon Mar 8 10:34:21 UTC 2021

Please review this refactoring change to unify G1CollectorPolicy::PauseKind and G1YCType enums under the same file. Additionally, make the distinction between collector types and phases clearer.

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Commit messages:
 - Refactoring G1CollectorPolicy::PauseKind and G1YCType enums

Changes: https://git.openjdk.java.net/jdk/pull/2870/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2870&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8143041
  Stats: 321 lines in 10 files changed: 152 ins; 123 del; 46 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2870.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2870/head:pull/2870

PR: https://git.openjdk.java.net/jdk/pull/2870