Revert "Use constant types to represent the fixed right arg of a MOD."

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 1fe593e9359754d3b4ad3290fe13348a6ed47ae6..0bbb90452a674c21619b8abc167594a1fc63f4b8 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1952,6 +1952,8 @@ class BinaryOperation V8_FINAL : public Expression {
   BailoutId RightId() const { return right_id_; }
 
   TypeFeedbackId BinaryOperationFeedbackId() const { return reuse(id()); }
+  Maybe<int> fixed_right_arg() const { return fixed_right_arg_; }
+  void set_fixed_right_arg(Maybe<int> arg) { fixed_right_arg_ = arg; }
 
   virtual void RecordToBooleanTypeFeedback(
       TypeFeedbackOracle* oracle) V8_OVERRIDE;
@@ -1975,6 +1977,10 @@ class BinaryOperation V8_FINAL : public Expression {
   Expression* left_;
   Expression* right_;
 
+  // TODO(rossberg): the fixed arg should probably be represented as a Constant
+  // type for the RHS.
+  Maybe<int> fixed_right_arg_;
+
   // The short-circuit logical operations need an AST ID for their
   // right-hand subexpression.
   const BailoutId right_id_;