First shot at static type propagation and type test elimination.

runtime/vm/object.h

 // 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.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 805 matching lines @@
 
   // The name of this type's class, i.e. without the type argument names of this
   // type.
   RawString* ClassName() const;
 
   // Check if this type represents the 'Dynamic' type.
   bool IsDynamicType() const {
     return HasResolvedTypeClass() && (type_class() == Object::dynamic_class());
   }
 
+  // Check if this type represents the 'Null' type.
+  bool IsNullType() const {
+    return HasResolvedTypeClass() && (type_class() == Object::null_class());
+  }
+
   // Check if this type represents the 'void' type.
   bool IsVoidType() const {
     return HasResolvedTypeClass() && (type_class() == Object::void_class());
   }
 
   bool IsObjectType() const {
     return HasResolvedTypeClass() &&
         Class::Handle(type_class()).IsObjectClass();
   }
 
@@ skipping 459 matching lines @@
     if (is_static()) {
       return false;
     }
     switch (kind()) {
       case RawFunction::kFunction:
       case RawFunction::kGetterFunction:
       case RawFunction::kSetterFunction:
       case RawFunction::kImplicitGetter:
       case RawFunction::kImplicitSetter:
         return true;
+      case RawFunction::kClosureFunction:
       case RawFunction::kConstructor:
       case RawFunction::kConstImplicitGetter:
       case RawFunction::kAbstract:
         return false;
       default:
         UNREACHABLE();
         return false;
     }
   }
   bool IsStaticFunction() const {
     if (!is_static()) {
       return false;
     }
     switch (kind()) {
       case RawFunction::kFunction:
       case RawFunction::kGetterFunction:
       case RawFunction::kSetterFunction:
       case RawFunction::kImplicitGetter:
       case RawFunction::kImplicitSetter:
       case RawFunction::kConstImplicitGetter:
         return true;
+      case RawFunction::kClosureFunction:
       case RawFunction::kConstructor:
         return false;
       default:
         UNREACHABLE();
         return false;
     }
   }
   bool IsInFactoryScope() const;
 
   intptr_t token_index() const { return raw_ptr()->token_index_; }
@@ skipping 3573 matching lines @@
 }
 
 
 intptr_t Stackmap::SizeInBits() const {
   return (Smi::Value(raw_ptr()->bitmap_size_in_bytes_) * kBitsPerByte);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_