RFR: 8353439: Shell grouping of -XX:OnError= commands is surprising

[Leonid Mesnik]

On Tue, 1 Apr 2025 10:59:16 GMT, Kevin Walls <kevinw at openjdk.org> wrote:

> We should be consistent, and run all OnError items in a new shell.  Currently the ; separator causes a new shell, but multiple -XX:OnError= options are grouped into the same shell.
> 
> next_OnError_command() decides on where a new command starts.  It should recognise newlines, and all commands will get their own shell.

Can you please add new regression test or update 
runtime/ErrorHandling/TestOnError.java
to test few arguments and your fix.

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Changes requested by lmesnik (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24354#pullrequestreview-2741006399