Make HCheckPrototypeMaps compatible with parallel recompilation.

src/hydrogen-instructions.cc

 // Copyright 2012 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 1187 matching lines @@
   return "";
 }
 
 void HCheckInstanceType::PrintDataTo(StringStream* stream) {
   stream->Add("%s ", GetCheckName());
   HUnaryOperation::PrintDataTo(stream);
 }
 
 
 void HCheckPrototypeMaps::PrintDataTo(StringStream* stream) {
-  stream->Add("[receiver_prototype=%p,holder=%p]", *prototype(), *holder());
+  stream->Add("[receiver_prototype=%p,holder=%p]",
+              *prototypes_.first(), *prototypes_.last());
 }
 
 
 void HCallStub::PrintDataTo(StringStream* stream) {
   stream->Add("%s ",
               CodeStub::MajorName(major_key_, false));
   HUnaryCall::PrintDataTo(stream);
 }
 
 
@@ skipping 1585 matching lines @@
 
 
 void HCheckFunction::Verify() {
   HInstruction::Verify();
   ASSERT(HasNoUses());
 }
 
 #endif
 
 } }  // namespace v8::internal