When checking against non-parametrized types use a cache to hold result tuples (class, result). Tha…

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 6277)
+++ runtime/vm/object.cc	(working copy)
@@ -5489,6 +5489,7 @@
     case PcDescriptors::kIcCall: return "ic-call";
     case PcDescriptors::kFuncCall: return "func-call";
     case PcDescriptors::kReturn: return "return";
+    case PcDescriptors::kTypeTest: return "type-test";
     case PcDescriptors::kOther: return "other";
   }
   UNREACHABLE();
@@ -5932,6 +5933,18 @@
 }
 
 
+uword Code::GetTypeTestAtNodeId(intptr_t node_id) const {
+  const PcDescriptors& descriptors = PcDescriptors::Handle(pc_descriptors());
+  for (intptr_t i = 0; i < descriptors.Length(); i++) {
+    if ((descriptors.NodeId(i) == node_id) &&
+        (descriptors.DescriptorKind(i) == PcDescriptors::kTypeTest)) {
+      return descriptors.PC(i);
+    }
+  }
+  return 0;
+}
+
+
 const char* Code::ToCString() const {
   const char* kFormat = "Code entry:0x%d";
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, EntryPoint());