Add bool value types to type inference.

pkg/compiler/lib/src/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 visitAwait(HAwait node);
   R visitBitAnd(HBitAnd node);
@@ skipping 858 matching lines @@
   HInstruction nonCheck() => this;
 
   /// Can this node throw an exception?
   bool canThrow() => false;
 
   /// Does this node potentially affect control flow.
   bool isControlFlow() => false;
 
   bool isExact() => instructionType.isExact || isNull();
 
+  bool isValue() => instructionType.isValue;
+
   bool canBeNull() => instructionType.isNullable;
 
   bool isNull() => instructionType.isEmpty && instructionType.isNullable;
   bool isConflicting() {
     return instructionType.isEmpty && !instructionType.isNullable;
   }
 
   /// Returns `true` if [typeMask] contains [cls].
   static bool containsType(
       TypeMask typeMask,
@@ skipping 2436 matching lines @@
 class HDynamicType extends HRuntimeType {
   HDynamicType(DynamicType dartType, TypeMask instructionType)
       : super(const <HInstruction>[], dartType, instructionType);
 
   accept(HVisitor visitor) => visitor.visitDynamicType(this);
 
   int typeCode() => HInstruction.DYNAMIC_TYPE_TYPECODE;
 
   bool typeEquals(HInstruction other) => other is HDynamicType;
 }