[kernel] Fix assert message.

runtime/vm/kernel_binary.cc

 // Copyright (c) 2016, 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.
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include "vm/kernel_binary.h"
 #include "platform/globals.h"
 #include "vm/flags.h"
 #include "vm/growable_array.h"
 #include "vm/kernel.h"
@@ skipping 1302 matching lines @@
   stmt->kernel_offset_ = reader->offset() - 1;  // -1 to include tag byte.
   return stmt;
 }
 
 
 AssertStatement* AssertStatement::ReadFrom(Reader* reader) {
   TRACE_READ_OFFSET();
   AssertStatement* stmt = new AssertStatement();
   stmt->kernel_offset_ = reader->offset() - 1;  // -1 to include tag byte.
   stmt->condition_ = Expression::ReadFrom(reader);
+  reader->ReadPosition();  // condition start offset.
+  reader->ReadPosition();  // condition end offset.
   stmt->message_ = reader->ReadOptional<Expression>();
 
   stmt->can_stream_ = stmt->condition_->can_stream() &&
                       (stmt->message_ == NULL || stmt->message_->can_stream());
 
   return stmt;
 }
 
 
 LabeledStatement* LabeledStatement::ReadFrom(Reader* reader) {
@@ skipping 546 matching lines @@
 
 kernel::Program* ReadPrecompiledKernelFromBuffer(const uint8_t* buffer,
                                                  intptr_t buffer_length) {
   kernel::Reader reader(buffer, buffer_length);
   return kernel::Program::ReadFrom(&reader);
 }
 
 
 }  // namespace dart
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)