Remove unused pc-descriptor kind kReturn.

runtime/vm/debugger.cc

 // 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.
 
 #include "vm/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 896 matching lines @@
     trace_.Add(frame);
   }
 }
 
 
 static bool IsSafeDescKind(PcDescriptors::Kind kind) {
   return ((kind == PcDescriptors::kIcCall) ||
           (kind == PcDescriptors::kOptStaticCall) ||
           (kind == PcDescriptors::kUnoptStaticCall) ||
           (kind == PcDescriptors::kClosureCall) ||
-          (kind == PcDescriptors::kReturn) ||
           (kind == PcDescriptors::kRuntimeCall));
 }
 
 
 static bool IsSafePoint(const PcDescriptors& desc, intptr_t i) {
   return IsSafeDescKind(desc.DescriptorKind(i)) &&
          (desc.TokenPos(i) != Scanner::kNoSourcePos);
 }
 
 
@@ skipping 1635 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart