List constructor sentinel must not implement 'int'

pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart

Index: pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
diff --git a/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart b/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
index 68e7e4ede814002bff1765b7b000b41cd87e1ece..f256d75a49203c1e140d91b24ed81c03f50dc3dd 100644
--- a/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
+++ b/pkg/compiler/lib/src/cps_ir/cps_ir_builder_task.dart
@@ -1905,7 +1905,10 @@ class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
 
     List<ir.Primitive> arguments = argumentsNode.nodes.mapToList(visit);
     // Use default values from the effective target, not the immediate target.
-    ConstructorElement target = constructor.effectiveTarget;
+    ConstructorElement target = constructor.implementation;
+    while (target.isRedirectingFactory && !target.isCyclicRedirection) {
+      target = target.effectiveTarget.implementation;
+    }
 
     callStructure = normalizeStaticArguments(callStructure, target, arguments);
     TypeMask allocationSiteType;
@@ -1916,10 +1919,11 @@ class IrBuilderVisitor extends ast.Visitor<ir.Primitive>
         Elements.isConstructorOfTypedArraySubclass(constructor, compiler)) {
       allocationSiteType = getAllocationSiteType(send);
     }
+    ConstructorElement constructorImplementation = constructor.implementation;
     return irBuilder.buildConstructorInvocation(
         target,
         callStructure,
-        constructor.computeEffectiveTargetType(type),
+        constructorImplementation.computeEffectiveTargetType(type),
         arguments,
         sourceInformationBuilder.buildNew(node),
         allocationSiteType: allocationSiteType);