Remove an unused field in the AST.

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 "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/code_descriptors.h"
@@ skipping 3255 matching lines @@
 
   Goto(try_entry);
   AppendFragment(try_entry, for_try_block);
   exit_ = for_try_block.exit_;
 
   // We are done generating code for the try block.
   owner()->set_try_index(old_try_index);
 
   CatchClauseNode* catch_block = node->catch_block();
   if (catch_block != NULL) {
-    // Set the corresponding try index for this catch block so
-    // that we can set the appropriate handler pc when we generate
-    // code for this catch block.
-    catch_block->set_try_index(try_index);
     EffectGraphVisitor for_catch_block(owner(), temp_index());
     catch_block->Visit(&for_catch_block);
     CatchBlockEntryInstr* catch_entry =
         new CatchBlockEntryInstr(owner()->AllocateBlockId(),
                                  old_try_index,
                                  catch_block->handler_types(),
                                  try_index);
     owner()->AddCatchEntry(catch_entry);
     ASSERT(!for_catch_block.is_open());
     AppendFragment(catch_entry, for_catch_block);
@@ skipping 224 matching lines @@
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, function_name, reason) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(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