Adding -XX option for overwriting HeapDumpPath

[Mariell Hoversholm]

Hi,

Would it be possible to add a new option for overwriting the file provided
by the `-XX:HeapDumpPath`[1] option?

Our use-case entails ensuring the created path is known beforehand to
running the JVM itself, and this is ensured by using `mktemp`[2].  In
short, because of how `mktemp` works, it will create an empty file to mark
it used; this fact is used to ensure there are no name collisions, as it
will simply re-generate a file name until it finds a non-existent file.  We
would like to preserve this ability (meaning we cannot use the "unsafe"
option `--dry-run`).

Feel free to move me to another mailing list if I chose the wrong one.  I
figure it was either this one or hotspot-runtime-dev at .

Cheers,
Mariell Hoversholm (she/they)

[1]:
https://github.com/openjdk/jdk17u/blob/d5fedc5b5fdfaa852894b6374873012645576f15/src/hotspot/share/runtime/globals.hpp#L537-L540
[2]: https://manpages.debian.org/buster/coreutils/mktemp.1.en.html
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