8356025: Provide a PrintVMInfoAtExit diagnostic switch

[tstuefe]

Provides a PrintVMInfoAtExit diagnostic switch that, if active, causes the JVM to print out the equivalent of jcmd VM.info before exiting.

The VM.info output contains a large range of valuable information about the JVM and the process.

The switch can be surprisingly useful, e.g. when analysing short-lived processes that are too quick to be analysed with jcmd, or analysing JVM child processes in a process tree, and so on. Going forward, it can also remove the need for some of the more specific PrintxxxAtExit flags.

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Issue

• JDK-8356025: Provide a PrintVMInfoAtExit diagnostic switch (Enhancement - P4)

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