* java/lang/Throwable.java (fillInStackTrace): Make native.
(printStackTrace): Call native method to do this.
(Throwable): Call fillInStackTrace.
(stackTrace): New variable.
* prims.cc: (_Jv_execName): New variable.
(catch_segv): Call fillInStackTrace.
(catch_fpe): Ditto.
(_Jv_ThisExecutable): New functions.
(JvRunMain): Set the name of this executable.