[turbofan] Introduce JSToInteger and JSToLength operators.

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index ef7496ab9b552d2651b0da714c2a7a904617852b..eb323c9c129aa3bd6bcd2d4907eb5732b4e9455e 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -404,10 +404,12 @@ class JSOperatorBuilder final : public ZoneObject {
   const Operator* Modulus(BinaryOperationHints hints);
 
   const Operator* ToBoolean(ToBooleanHints hints);
-  const Operator* ToNumber();
-  const Operator* ToString();
+  const Operator* ToInteger();
+  const Operator* ToLength();
   const Operator* ToName();
+  const Operator* ToNumber();
   const Operator* ToObject();
+  const Operator* ToString();
   const Operator* Yield();
 
   const Operator* Create();