Remove duplicate limit method definitions

Author: eregon

src/main/java/org/truffleruby/language/objects/MetaClassNode.java

@@ -132,8 +132,4 @@ protected RubyClass metaClassForeign(Object object,
     protected int getCacheLimit() {
         return getLanguage().options.CLASS_CACHE;
     }
-
-    protected int getIdentityCacheContextLimit() {
-        return getLanguage().options.CONTEXT_SPECIFIC_IDENTITY_CACHE;
-    }
 }

src/main/java/org/truffleruby/language/objects/SingletonClassNode.java

@@ -144,10 +144,6 @@ protected int getCacheLimit() {
         return getLanguage().options.CLASS_CACHE;
     }
 
-    protected int getIdentityCacheContextLimit() {
-        return getLanguage().options.CONTEXT_SPECIFIC_IDENTITY_CACHE;
-    }
-
     abstract RubyNode getValueNode();
 
     @Override