RFR: 8255982: Extend BasicJMapTest to test with different GC Heap [v4]

[Lin Zang]

> The implementation of jmap tool depends on the implementation of object iteration by different GC heap.
> This patch extend the BasicJMapTest to cover differet GC Heap.

Lin Zang has updated the pull request incrementally with one additional commit since the last revision:

  Add test id

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1094/files
  - new: https://git.openjdk.java.net/jdk/pull/1094/files/02b37920..3d9f6e5d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1094&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1094&range=02-03

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1094.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1094/head:pull/1094

PR: https://git.openjdk.java.net/jdk/pull/1094