Dwarf tools interpret line number table pc's as start boundries instead of end boundries.

runtime/vm/object.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/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/become.h"
@@ skipping 9132 matching lines @@
   ASSERT(col_offset >= 0);
   StoreNonPointer(&raw_ptr()->line_offset_, line_offset);
   StoreNonPointer(&raw_ptr()->col_offset_, col_offset);
 }
 
 
 // Specialized for AOT compilation, which does this lookup for every token
 // position that could be part of a stack trace.
 intptr_t Script::GetTokenLineUsingLineStarts(
     TokenPosition target_token_pos) const {
+  if (target_token_pos.IsNoSource()) {
+    return 0;
+  }
   Zone* zone = Thread::Current()->zone();
   Array& line_starts_array = Array::Handle(zone, line_starts());
   Smi& token_pos = Smi::Handle(zone);
   if (line_starts_array.IsNull()) {
     ASSERT(kind() != RawScript::kKernelTag);
     GrowableObjectArray& line_starts_list =
         GrowableObjectArray::Handle(zone, GrowableObjectArray::New());
     const TokenStream& tkns = TokenStream::Handle(zone, tokens());
     TokenStream::Iterator tkit(zone, tkns, TokenPosition::kMinSource,
                                TokenStream::Iterator::kAllTokens);
@@ skipping 13888 matching lines @@
   return UserTag::null();
 }
 
 
 const char* UserTag::ToCString() const {
   const String& tag_label = String::Handle(label());
   return tag_label.ToCString();
 }
 
 }  // namespace dart