RFR: 8267666: Add option to jcmd GC.heap_dump to use existing file [v4]

[Anton Kozlov]

On Wed, 2 Jun 2021 20:57:02 GMT, Anton Kozlov <akozlov at openjdk.org> wrote:

>> Please review a small change that adds an option to GC.heap_dump to use an existing file. 
>> 
>> The option is necessary if the target file is a predefined file-like object, like a named pipe. This opens up a lot of possibilities to process a heap dump without storing it to the file system first.
>> 
>> Reviews of the CSR linked to the bug would be appreciated as well.
>
> Anton Kozlov has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Fix windows flags (although complied fine)

Thanks for the comments! Indeed, the change is about the "overwrite" option only. The CSR describes why the option is necessary, and sockets and pipes are just examples. I have rephrased CSR to be more explicit about the option, but not examples.

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PR: https://git.openjdk.java.net/jdk/pull/4183