[turbofan] Introduce a dedicated CheckMaps simplified operator.

src/compiler/simplified-operator.h

Index: src/compiler/simplified-operator.h
diff --git a/src/compiler/simplified-operator.h b/src/compiler/simplified-operator.h
index 0b5d08b68a3bddaa8c4b9743a59016144a8ec76c..6cdcefeb0da23532b892218b250fe90589e61688 100644
--- a/src/compiler/simplified-operator.h
+++ b/src/compiler/simplified-operator.h
@@ -273,6 +273,7 @@ class SimplifiedOperatorBuilder final : public ZoneObject {
 
   const Operator* CheckIf();
   const Operator* CheckBounds();
+  const Operator* CheckMaps(int map_input_count);
   const Operator* CheckNumber();
   const Operator* CheckString();
   const Operator* CheckTaggedPointer();