[RFA] Check for null arguments when interpreting static methods

[Kyle Galloway]

If _Jv_CompileMethod is called while debugging with a static method, the 
debugging code that finds the "this" pointer in _Jv_InterpMethod::run 
will attempt to dereference args, but this is set to NULL when the call 
is made.  This patch checks if args is NULL before attempting to 
retrieve the "this" pointer.

ChangeLog
2007-04-09  Kyle Galloway  <kgallowa@redhat.com>

    * interpret-run.cc: If debugging, check if args is NULL before 
getting the "this" pointer.

Questions/comments/concerns?

Thanks,
Kyle
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