RFR: 8250961: Move Universe::update_heap_info_at_gc to CollectedHeap [v2]

[Aditya Mandaleeka]

> This is a small refactoring that moves `update_heap_info_at_gc()` and related members to `CollectedHeap`. There should
> be no behavioral change.
> jdk/hotspot tier1 passed
> 
> JBS: https://bugs.openjdk.java.net/browse/JDK-8250961

Aditya Mandaleeka has updated the pull request incrementally with one additional commit since the last revision:

  Rename and rearrange things a bit per feedback.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/27/files
  - new: https://git.openjdk.java.net/jdk/pull/27/files/0263ed99..64d1c399

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=27&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=27&range=00-01

  Stats: 33 lines in 11 files changed: 11 ins; 9 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/27.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/27/head:pull/27

PR: https://git.openjdk.java.net/jdk/pull/27