removed redundant method overriders after "Method is identical to its supermethod" inspection run

src/org/jetbrains/java/decompiler/code/SimpleInstructionSequence.java

@@ -18,8 +18,4 @@ public class SimpleInstructionSequence extends InstructionSequence {
 
     return newseq;
   }
-
-  public void removeInstruction(int index) {
-    collinstr.remove(index);
-  }
 }

src/org/jetbrains/java/decompiler/modules/decompiler/ExprentStack.java

@@ -14,10 +14,6 @@ public class ExprentStack extends ListStack<Exprent> {
     pointer = list.getPointer();
   }
 
-  public void push(Exprent item) {
-    super.push(item);
-  }
-
   public Exprent pop() {
 
     return this.remove(--pointer);