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

[Igor Ignatyev]

On Wed, 11 Nov 2020 11:24:08 GMT, Lin Zang <lzang at openjdk.org> wrote:

>> 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

Hi @linzang ,

it all looks good to me, I'd, however, keep `@build` tags as they were before, this is one of a few difference b/w jdk and hotspot test suites ( in this particular case, it actually matters as discrepancies can lead to sporadic failures). in jdk test-suite, people use a sufficient set of  `@build` tag.

-- Igor

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Changes requested by iignatyev (Reviewer).

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