remove SignatureInfo class

src/objects-printer.cc

Index: src/objects-printer.cc
diff --git a/src/objects-printer.cc b/src/objects-printer.cc
index b7329a98a83b09ccee8d24fc96a7bae07ab05d5a..3af953a0b83f125443dce49459d080ace046ec46 100644
--- a/src/objects-printer.cc
+++ b/src/objects-printer.cc
@@ -941,14 +941,6 @@ void ObjectTemplateInfo::ObjectTemplateInfoPrint(std::ostream& os) {  // NOLINT
 }
 
 
-void SignatureInfo::SignatureInfoPrint(std::ostream& os) {  // NOLINT
-  HeapObject::PrintHeader(os, "SignatureInfo");
-  os << "\n - receiver: " << Brief(receiver());
-  os << "\n - args: " << Brief(args());
-  os << "\n";
-}
-
-
 void TypeSwitchInfo::TypeSwitchInfoPrint(std::ostream& os) {  // NOLINT
   HeapObject::PrintHeader(os, "TypeSwitchInfo");
   os << "\n - types: " << Brief(types());