* src/native/vm/openjdk/jvm.cpp (JVM_CurrentClassLoader): Implemented.

* src/native/vm/openjdk/jvm.cpp (JVM_CurrentClassLoader): Implemented.
* src/vm/javaobjects.hpp [ENABLE_JAVASE] (java_lang_ClassLoader): Added.
* src/vm/javaobjects.cpp (java_lang_ClassLoader::invoke_getSystemClassLoader):
Implemented new invocation wrapper method.
* src/vm/loader.cpp (load_class_from_sysloader): Use above invocation wrapper.
* src/vm/jit/stacktrace.cpp (stacktrace_first_nonsystem_classloader): Added.
* src/vm/jit/stacktrace.hpp: Likewise.
* src/vm/vm.cpp (vm_get_mainclass_from_jar): Added workaround to make it
compile with CLDC. We have to look into this at some point.