[kernel] Debugging of switch statement

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 "platform/globals.h"
 #include "vm/flags.h"
 #include "vm/growable_array.h"
 #include "vm/kernel.h"
 #include "vm/kernel_to_il.h"
@@ skipping 1581 matching lines @@
     SwitchCase* sc = stmt->cases_[i];
     sc->ReadFrom(reader);
   }
   return stmt;
 }
 
 
 SwitchCase* SwitchCase::ReadFrom(Reader* reader) {
   TRACE_READ_OFFSET();
   expressions_.ReadFromStatic<Expression>(reader);
+  for (intptr_t i = 0; i < expressions_.length(); ++i) {
+    expressions_[i]->set_position(reader->ReadPosition());
+  }
   is_default_ = reader->ReadBool();
   body_ = Statement::ReadFrom(reader);
   return this;
 }
 
 
 ContinueSwitchStatement* ContinueSwitchStatement::ReadFrom(Reader* reader) {
   TRACE_READ_OFFSET();
   ContinueSwitchStatement* stmt = new ContinueSwitchStatement();
   stmt->target_ = reader->helper()->switch_cases().Lookup(reader->ReadUInt());
@@ skipping 324 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)