RFR: 8272725: G1: replace type needs_remset_update_t with bool [v2]

[Albert Mingkun Yang]

> Simple type change in `struct G1HeapRegionAttr`.
> 
> Test: hotspot_gc

Albert Mingkun Yang has updated the pull request incrementally with two additional commits since the last revision:

 - review
 - Revert "boolean"
   
   This reverts commit 2a23beb0549a928ae3876070dbdcf5a153c0703d.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/5188/files
  - new: https://git.openjdk.java.net/jdk/pull/5188/files/2a23beb0..190215c8

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=5188&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=5188&range=00-01

  Stats: 6 lines in 1 file changed: 3 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5188.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5188/head:pull/5188

PR: https://git.openjdk.java.net/jdk/pull/5188