RFR: 8261356: Clean up enum G1Mark [v2]

Tue Feb 9 12:45:51 UTC 2021

> After removing the effectively dead entry in `G1Mark`, the whole enum could be turned into a bool. The call-chain is updated and existing comments are revised.

Albert Mingkun Yang has updated the pull request incrementally with one additional commit since the last revision:

  review

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/2461/files
  - new: https://git.openjdk.java.net/jdk/pull/2461/files/946660de..1a17ae19

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=2461&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=2461&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2461.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2461/head:pull/2461

PR: https://git.openjdk.java.net/jdk/pull/2461