Remove duplicate receive_self in methods

Author: subbuss

core/src/main/java/org/jruby/ir/IRBuilder.java

@@ -1659,8 +1659,6 @@ protected IRMethod defineMethodInner(MethodDefNode defNode, IRMethod method, IRS
             addInstr(method, new TraceInstr(RubyEvent.CALL, method.getName(), method.getFileName(), method.getLineNumber()));
         }
 
-        addInstr(method, new ReceiveSelfInstr(method.getSelf()));
-
         // Prepare all implicit state (self, frame block, etc)
         prepareImplicitState(method);