Add type propagation phase in optimizing compiler (work in progress).

runtime/vm/flow_graph_compiler.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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 393 matching lines @@
   args.Add(kImmutableArray);
   CheckClassIds(kClassIdReg, args, is_instance_lbl, &unknown);
   assembler()->Bind(&unknown);
 }
 
 
 void FlowGraphCompiler::EmitComment(Instruction* instr) {
   char buffer[256];
   BufferFormatter f(buffer, sizeof(buffer));
   instr->PrintTo(&f);
-  assembler()->Comment("@%d: %s", instr->cid(), buffer);
+  assembler()->Comment("%s", buffer);
 }
 
 
 void FlowGraphCompiler::EmitLoadIndexedGeneric(LoadIndexedComp* comp) {
   const String& function_name =
       String::ZoneHandle(Symbols::New(Token::Str(Token::kINDEX)));
 
   AddCurrentDescriptor(PcDescriptors::kDeopt,
                        comp->cid(),
                        comp->token_pos(),
@@ skipping 377 matching lines @@
       return;
     }
   }
 
   // This move is not blocked.
   EmitMove(index);
 }
 
 
 }  // namespace dart