Allow the VM to read Kernel files with external libraries

runtime/vm/kernel_binary.h

 // Copyright (c) 2017, 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 RUNTIME_VM_KERNEL_BINARY_H_
 #define RUNTIME_VM_KERNEL_BINARY_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include <map>
@@ skipping 188 matching lines @@
   }
 
   intptr_t ReadListLength() { return ReadUInt(); }
 
   uint8_t ReadByte() { return buffer()[offset_++]; }
 
   uint8_t PeekByte() { return buffer()[offset_]; }
 
   bool ReadBool() { return (ReadByte() & 1) == 1; }
 
-  word ReadFlags() { return ReadByte(); }
+  uint8_t ReadFlags() { return ReadByte(); }
 
   Tag ReadTag(uint8_t* payload = NULL) {
     uint8_t byte = ReadByte();
     bool has_payload = (byte & kSpecializedTagHighBit) != 0;
     if (has_payload) {
       if (payload != NULL) {
         *payload = byte & kSpecializedPayloadMask;
       }
       return static_cast<Tag>(byte & kSpecializedTagMask);
     } else {
@@ skipping 118 matching lines @@
   Reader* reader_;
   TokenPosition min_;
   TokenPosition max_;
 };
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_BINARY_H_