RFR: JDK-8309297: Adjust ShenandoahHeap print_heap_regions_on [v2]

[Matthias Baesken]

> The ShenandoahHeap print_heap_regions_on method prints some brief description of the columns of the heap table, however the description is unsorted and seems to be not fully up to date.
> 
> Another thought - is the critical pins column (CP=critical pins)  still needed or always 0  and obsolete now?

Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:

  remove comment line

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14264/files
  - new: https://git.openjdk.org/jdk/pull/14264/files/463e1e02..4e96461f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14264&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14264&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14264.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14264/head:pull/14264

PR: https://git.openjdk.org/jdk/pull/14264