jvmti-int.h (JVMTI): Declare member "enabled".

jvmti-int.h (JVMTI): Declare member "enabled".

        * include/jvmti-int.h (JVMTI): Declare member "enabled".
        * jvmti.cc (JVMTI): Add member "enabled".
        (_Jv_GetJVMTIEnv): Mark JVMTI enabled.
        * interpret.cc (_Jv_InterpMethod::ncode): Use JVMTI::enabled
        instead of gnu::classpath::jdwp::Jdwp::isDebugging.
        (_Jv_CompileMethod): If JVMTI is enabled, use run_debug
        instead of run to compile the method.

        * interpret-run.cc [DEBUG] (NEXT_INSN): Add JVMTI single step
        notification.

From-SVN: r121468