Add tags for new failing specs

Author: eregon

spec/tags/core/numeric/dup_tags.txt

@@ -0,0 +1 @@
+fails:Numeric#dup returns self

spec/tags/core/objectspace/define_finalizer_tags.txt

@@ -5,3 +5,7 @@ fails:ObjectSpace.define_finalizer allows multiple finalizers with different 'ca
 slow:ObjectSpace.define_finalizer calls a finalizer at exit even if it is self-referencing
 slow:ObjectSpace.define_finalizer calls a finalizer at exit even if it is indirectly self-referencing
 slow:ObjectSpace.define_finalizer calls a finalizer defined in a finalizer running at exit
+fails:ObjectSpace.define_finalizer accepts an object and a block
+fails:ObjectSpace.define_finalizer calls a finalizer at exit even if it is self-referencing
+fails:ObjectSpace.define_finalizer calls a finalizer at exit even if it is indirectly self-referencing
+fails:ObjectSpace.define_finalizer calls a finalizer defined in a finalizer running at exit