RFR: 8282072: G1: Rename CardSetPtr to CardSetContainerPtr [v3]

[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:

  CardSet Container types

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/7816/files
  - new: https://git.openjdk.java.net/jdk/pull/7816/files/88ca4ac9..92161dc9

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=7816&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=7816&range=01-02

  Stats: 69 lines in 5 files changed: 0 ins; 0 del; 69 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