Print whether a HCheckPrototypeMaps is omitted.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index b33ae3c9f260cbd199e6c0334f820f5d5d5cbb5f..f622c25496f0a6d66ffce227bb6bb45c207396a3 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1412,8 +1412,9 @@ void HCheckInstanceType::PrintDataTo(StringStream* stream) {
 
 
 void HCheckPrototypeMaps::PrintDataTo(StringStream* stream) {
-  stream->Add("[receiver_prototype=%p,holder=%p]",
-              *prototypes_.first(), *prototypes_.last());
+  stream->Add("[receiver_prototype=%p,holder=%p]%s",
+              *prototypes_.first(), *prototypes_.last(),
+              CanOmitPrototypeChecks() ? " (omitted)" : "");
 }