RFR: 8299953: Merge ContiguousSpaceDCTOC into DirtyCardToOopClosure [v2]

[Albert Mingkun Yang]

> Simple change of merging a class into its super class.
> 
> Test: hotspot_gc
> 
> PS: `git diff --color-moved=dimmed_zebra` might be useful to see the diff.

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

  review

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/11938/files
  - new: https://git.openjdk.org/jdk/pull/11938/files/bd0ba799..a715cd4d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11938&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11938&range=00-01

  Stats: 17 lines in 1 file changed: 0 ins; 0 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/11938.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11938/head:pull/11938

PR: https://git.openjdk.org/jdk/pull/11938