RFR: 8259070: Add jcmd option to dump CDS [v4]

[Yumin Qi]

On Sat, 27 Feb 2021 18:11:38 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> How would it overflow? But I agree, I would not add jsa extension if the user did not specify one. I dislike when programs do that.
>
> `file_name` is user input that comes from the jcmd, so it can be arbitrarily long and exceed JVM_MAXPATHLEN characters.

The stuff no in java code, and is simple to deal with.

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PR: https://git.openjdk.java.net/jdk/pull/2737