Delete some unused code

Author: dibyendumajumdar

optvm/src/main/java/com/compilerprogramming/ezlang/compiler/RegisterPool.java

@@ -24,12 +24,6 @@ public Register newReg(String baseName, Type type) {
         registers.add(reg);
         return reg;
     }
-    public Register newISSAReg(String baseName, Type type) {
-        var id = registers.size();
-        var reg = new Register(id, baseName + "_" + id, type);
-        registers.add(reg);
-        return reg;
-    }
     public Register newTempReg(Type type) {
         var id = registers.size();
         var name = "%t"+id;

types/src/main/java/com/compilerprogramming/ezlang/types/Symbol.java

@@ -39,18 +39,6 @@ public static class VarSymbol extends Symbol {
         public VarSymbol(String name, Type type) {
             super(name, type);
         }
-
-        @Override
-        public boolean equals(Object o) {
-            if (o == null || getClass() != o.getClass()) return false;
-            VarSymbol varSymbol = (VarSymbol) o;
-            return regNumber == varSymbol.regNumber;
-        }
-
-        @Override
-        public int hashCode() {
-            return Objects.hashCode(regNumber);
-        }
     }
 
     public static class ParameterSymbol extends VarSymbol {