RFR: 8314501: Shenandoah: sun/tools/jhsdb/heapconfig/JMapHeapConfigTest.java fails [v2]

[Aleksey Shipilev]

> Current test expects `G1HeapRegionSize` flag to be printed out from jmap. But that one is not printed when Shenandoah is enabled. I opted for the minimally intrusive fix: move the additional Shenandoah printout to the Shenandoah-specific block.
> 
> Additional testing:
>  - [x] Affected test now passes with Shenandoah, continues to pass with G1, Serial, Parallel
>  - [x] `sun/tools/jhsdb` passes with {Serial, Parallel, G1, Shenandoah}
>  - [x] `serviceability/sa` passes with {Serial, Parallel, G1, Shenandoah}

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  More fixes

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15328/files
  - new: https://git.openjdk.org/jdk/pull/15328/files/53d3c3ad..f5b69ad1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15328&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15328&range=00-01

  Stats: 5 lines in 2 files changed: 2 ins; 1 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/15328.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15328/head:pull/15328

PR: https://git.openjdk.org/jdk/pull/15328