RFR: 8282072: G1: Rename CardSetPtr to CardSetContainerPtr [v4]

[Ivan Walulya]

> Hi all,
> Please review this change to rename CardSetPtr to ContainerPtr since it is a pointer to the containers. 
> 
> Testing: tier1

Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:

  space

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7816/files
  - new: https://git.openjdk.java.net/jdk/pull/7816/files/92161dc9..38e59685

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7816&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7816&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7816.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7816/head:pull/7816

PR: https://git.openjdk.java.net/jdk/pull/7816