Proposal: Add overwrite heapdump flag to java

[Elon Azoulay]

Hi,
I submitted a pull request <https://github.com/openjdk/jdk/pull/13276> to
expose the overwrite flag to HeapDumpOnOutOfMemoryError.
The flag is already exposed to jcmd as -overwrite.This is to facilitate
creating a heapdump within a container native environment.
We use this internally to dump the heap dump to a fifo so that we could
read it in a separate container.Let me know what needs to be done in terms
of creating an issue and getting my pr merged.

I am a new contributor and would be happy to contribute more!

Cheers,

Elon
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