* jni.cc (MARK_NONE): New define.
(MARK_USER): Likewise.
(MARK_SYSTEM): Likewise.
(struct _Jv_JNI_LocalFrame): Made `marker' bigger and `size'
smaller.
(_Jv_JNI_DeleteLocalRef): Use MARK_NONE in assert.
(_Jv_JNI_EnsureLocalCapacity): Use MARK_NONE.
(_Jv_JNI_PushLocalFrame): Use MARK_USER.
(_Jv_JNI_PopLocalFrame): New version with additional `stop'
argument.
(call): Use MARK_SYSTEM.
(_Jv_GetJNIEnvNewFrame): New function.
(_Jv_LookupJNIMethod): New function.
(_Jv_JNI_PopSystemFrame): New function.
(call): Use _Jv_JNI_PopSystemFrame and _Jv_LookupJNIMethod.