Make upstream adapt ForceEarlyReturn, ThrowExceptionAction and ThreadDumpAction to make it support gdb

[daym]

Currently, ThrowExceptionAction, ForceEarlyReturnAction and ThreadDumpAction hard-code Java-specific classes even though they are also shown in the Debugger Actions menu for programs debugged via gdb (greyed out).

It is not possible to implement those for gdb right now. Upstream would have to adapt it to be more agnostic to programming languages.