Fix a pair of flow graph construction issues.

runtime/vm/flow_graph_builder.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/flow_graph_builder.h"
 
 #include "vm/ast_printer.h"
 #include "vm/code_descriptors.h"
 #include "vm/dart_entry.h"
 #include "vm/flags.h"
@@ skipping 1990 matching lines @@
 void EffectGraphVisitor::BuildThrowNode(ThrowNode* node) {
   ValueGraphVisitor for_exception(owner(), temp_index());
   node->exception()->Visit(&for_exception);
   Append(for_exception);
   Instruction* instr = NULL;
   if (node->stacktrace() == NULL) {
     instr = new ThrowInstr(node->token_index(),
                            owner()->try_index(),
                            for_exception.value());
   } else {
-    ValueGraphVisitor for_stack_trace(owner(), temp_index() + 1);
+    ValueGraphVisitor for_stack_trace(owner(), temp_index());
     node->stacktrace()->Visit(&for_stack_trace);
     Append(for_stack_trace);
     instr = new ReThrowInstr(node->token_index(),
                              owner()->try_index(),
                              for_exception.value(),
                              for_stack_trace.value());
   }
   AddInstruction(instr);
 }
 
@@ skipping 597 matching lines @@
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len));
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart