use bit fields for class state and field type values. This shrinks the snapshot

vm/raw_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_RAW_OBJECT_H_
 #define VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 #include "vm/token.h"
@@ skipping 389 matching lines @@
     return reinterpret_cast<RawObject**>(&ptr()->allocation_stub_);
   }
 
   cpp_vtable handle_vtable_;
   intptr_t instance_size_;  // Size if fixed length or 0 if variable length.
   intptr_t id_;  // Class Id, also index in the class table.
   intptr_t type_arguments_instance_field_offset_;  // May be kNoTypeArguments.
   intptr_t next_field_offset_;  // Offset of the next instance field.
   intptr_t num_native_fields_;  // Number of native fields in class.
   intptr_t token_pos_;
-  int8_t class_state_;  // Of type ClassState.
-  bool is_const_;
-  bool is_interface_;
+  uint8_t state_bits_;  // state, is_const, is_interface.
 
   friend class Object;
   friend class RawInstance;
   friend class RawInstructions;
   friend class SnapshotReader;
 };
 
 
 class RawUnresolvedClass : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(UnresolvedClass);
@@ skipping 181 matching lines @@
   RAW_HEAP_OBJECT_IMPLEMENTATION(Field);
 
   RawObject** from() { return reinterpret_cast<RawObject**>(&ptr()->name_); }
   RawString* name_;
   RawClass* owner_;
   RawAbstractType* type_;
   RawInstance* value_;  // Offset for instance and value for static fields.
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->value_); }
 
   intptr_t token_pos_;
-  bool is_static_;
-  bool is_final_;
-  bool is_const_;
-  bool has_initializer_;
+  uint8_t kind_bits_;  // static, final, const, has initializer.
 };
 
 
 class RawLiteralToken : public RawObject {
   RAW_HEAP_OBJECT_IMPLEMENTATION(LiteralToken);
 
   RawObject** from() {
     return reinterpret_cast<RawObject**>(&ptr()->literal_);
   }
   RawString* literal_;  // Literal characters as they appear in source text.
@@ skipping 925 matching lines @@
          kExternalUint64ArrayCid == kByteArrayCid + 18 &&
          kExternalFloat32ArrayCid == kByteArrayCid + 19 &&
          kExternalFloat64ArrayCid == kByteArrayCid + 20 &&
          kStacktraceCid == kByteArrayCid + 21);
   return (index >= kByteArrayCid && index <= kExternalFloat64ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // VM_RAW_OBJECT_H_