Cleanup and fix generated comments in the top-level compiler.

src/x64/fast-codegen-x64.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 318 matching lines @@
   __ push(source);
   ToBooleanStub stub;
   __ CallStub(&stub);
   __ testq(rax, rax);  // The stub returns nonzero for true.
   __ j(not_zero, true_label);
   __ jmp(false_label);
 }
 
 
 void FastCodeGenerator::VisitDeclaration(Declaration* decl) {
+  Comment cmnt(masm_, "[ Declaration");
   Variable* var = decl->proxy()->var();
   ASSERT(var != NULL);  // Must have been resolved.
   Slot* slot = var->slot();
   ASSERT(slot != NULL);  // No global declarations here.
 
   // We have 3 cases for slots: LOOKUP, LOCAL, CONTEXT.
   switch (slot->type()) {
     case Slot::LOOKUP: {
       __ push(rsi);
       __ Push(var->name());
@@ skipping 1198 matching lines @@
   true_label_ = saved_true;
   false_label_ = saved_false;
   // Convert current context to test context: End post-test code.
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal