Add comment to generated code that says which code generator compiled it.

src/x64/full-codegen-x64.cc

 // Copyright 2010 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 37 matching lines @@
 //   o rsi: our context
 //   o rbp: our caller's frame pointer
 //   o rsp: stack pointer (pointing to return address)
 //
 // The function builds a JS frame.  Please see JavaScriptFrameConstants in
 // frames-x64.h for its layout.
 void FullCodeGenerator::Generate(CompilationInfo* info, Mode mode) {
   ASSERT(info_ == NULL);
   info_ = info;
   SetFunctionPosition(function());
+  Comment cmnt(masm_, "[ function compiled by full code generator");
 
   if (mode == PRIMARY) {
     __ push(rbp);  // Caller's frame pointer.
     __ movq(rbp, rsp);
     __ push(rsi);  // Callee's context.
     __ push(rdi);  // Callee's JS Function.
 
     { Comment cmnt(masm_, "[ Allocate locals");
       int locals_count = scope()->num_stack_slots();
       if (locals_count == 1) {
@@ skipping 1914 matching lines @@
   __ movq(Operand(rsp, 0), rdx);
   // And return.
   __ ret(0);
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal