Use call counts to prevent cold calls from being inlined.

runtime/vm/object.cc

Index: runtime/vm/object.cc
===================================================================
--- runtime/vm/object.cc	(revision 16141)
+++ runtime/vm/object.cc	(working copy)
@@ -7794,6 +7794,16 @@
 }
 
 
+intptr_t ICData::AggregateCount() const {
+  const intptr_t len = NumberOfChecks();
+  intptr_t count = 0;
+  for (intptr_t i = 0; i < len; i++) {
+    count += GetCountAt(i);
+  }
+  return count;
+}
+
+
 RawFunction* ICData::GetTargetForReceiverClassId(intptr_t class_id) const {
   const intptr_t len = NumberOfChecks();
   for (intptr_t i = 0; i < len; i++) {