RFR: 8250961: Move Universe::update_heap_info_at_gc to CollectedHeap [v3]

[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:

  Fix spacing and make functions const.

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/27/files
  - new: https://git.openjdk.java.net/jdk/pull/27/files/64d1c399..59b0c8d7

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=27&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=27&range=01-02

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 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