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

[Xin Liu]

On Thu, 1 Oct 2020 13:26:12 GMT, Tobias Hartmann <thartmann at openjdk.org> wrote:

>> Node::dump(depth) indents 2 whitespaces for each level.
>> The function isnot on until the depth of the ideal graph isnot greater
>> than PrintIdealIndentThreshold (0 by default).
>
> 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.

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