RFR: 8251464: make Node::dump(int depth) support indent [v3]

[Xin Liu]

On Thu, 1 Oct 2020 19:06:16 GMT, Xin Liu <xliu at openjdk.org> wrote:

>> This looks good to me but please make sure that there are no other tests depending on the tab character in the output.
>
> Thanks Tobias!
> I ran tier1 test and it looks good. Let me verify it using submit repo before I integrate it.

pass all tests: https://github.com/navyxliu/jdk/actions/runs/283309901

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PR: https://git.openjdk.java.net/jdk/pull/371