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

src/arm/codegen-arm.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 127 matching lines @@
 
 // Calling conventions:
 // fp: caller's frame pointer
 // sp: stack pointer
 // r1: called JS function
 // cp: callee's context
 
 void CodeGenerator::Generate(CompilationInfo* info) {
   // Record the position for debugging purposes.
   CodeForFunctionPosition(info->function());
+  Comment cmnt(masm_, "[ function compiled by virtual frame code generator");
 
   // Initialize state.
   info_ = info;
   ASSERT(allocator_ == NULL);
   RegisterAllocator register_allocator(this);
   allocator_ = &register_allocator;
   ASSERT(frame_ == NULL);
   frame_ = new VirtualFrame();
   cc_reg_ = al;
   {
@@ skipping 7499 matching lines @@
 
   // Just jump to runtime to add the two strings.
   __ bind(&string_add_runtime);
   __ TailCallRuntime(ExternalReference(Runtime::kStringAdd), 2, 1);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal