Always explicitely give a type to HInvokeStatic, and make the literal map know it's a map.

sdk/lib/_internal/compiler/implementation/ssa/nodes.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of ssa;
 
 abstract class HVisitor<R> {
   R visitAdd(HAdd node);
   R visitBailoutTarget(HBailoutTarget node);
   R visitBitAnd(HBitAnd node);
@@ skipping 1423 matching lines @@
       setAllSideEffects();
       setDependsOnSomething();
     }
   }
   toString() => 'invoke dynamic setter: $selector';
   accept(HVisitor visitor) => visitor.visitInvokeDynamicSetter(this);
 }
 
 class HInvokeStatic extends HInvoke {
   /** The first input must be the target. */
-  HInvokeStatic(inputs, [HType knownType = HType.UNKNOWN]) : super(inputs) {
-    guaranteedType = knownType;
+  HInvokeStatic(inputs, HType type) : super(inputs) {
+    guaranteedType = type;
   }
 
   toString() => 'invoke static: ${element.name}';
   accept(HVisitor visitor) => visitor.visitInvokeStatic(this);
   int typeCode() => HInstruction.INVOKE_STATIC_TYPECODE;
   Element get element => target.element;
   HStatic get target => inputs[0];
 }
 
 class HInvokeSuper extends HInvokeStatic {
   final bool isSetter;
-  HInvokeSuper(inputs, {this.isSetter: false}) : super(inputs);
+  HInvokeSuper(inputs, {this.isSetter: false}) : super(inputs, HType.UNKNOWN);
   toString() => 'invoke super: ${element.name}';
   accept(HVisitor visitor) => visitor.visitInvokeSuper(this);
 
   HInstruction get value {
     assert(isSetter);
     // Index 0: the element, index 1: 'this'.
     return inputs[2];
   }
 }
 
@@ skipping 1234 matching lines @@
   HBasicBlock get start => expression.start;
   HBasicBlock get end {
     // We don't create a switch block if there are no cases.
     assert(!statements.isEmpty);
     return statements.last.end;
   }
 
   bool accept(HStatementInformationVisitor visitor) =>
       visitor.visitSwitchInfo(this);
 }