Add CPtrCompare in ASR

Author: Smit-create

src/libasr/ASR.asdl

@@ -277,6 +277,8 @@ expr
     | StringOrd(expr arg, ttype type, expr? value)
     | StringChr(expr arg, ttype type, expr? value)
 
+    | CPtrCompare(expr left, cmpop op, expr right, ttype type, expr? value)
+
     | DictConstant(expr* keys, expr* values, ttype type)
     | DictLen(expr arg, ttype type, expr? value)