RFR: 8321808: G1: Use unsigned type for non-negative G1 flags [v2]

[Albert Mingkun Yang]

> Simple type update for some G1 flags.

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

  review

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Changes:
  - all: https://git.openjdk.org/jdk/pull/17063/files
  - new: https://git.openjdk.org/jdk/pull/17063/files/780a4318..23235339

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17063&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17063&range=00-01

  Stats: 3 lines in 1 file changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/17063.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17063/head:pull/17063

PR: https://git.openjdk.org/jdk/pull/17063