Revert "Optimizations to IC stub for unoptimized code performance on x64."

runtime/vm/object.cc

Index: runtime/vm/object.cc
diff --git a/runtime/vm/object.cc b/runtime/vm/object.cc
index 851aa9344557a034ce1c18270680b57882852ddf..389132ed78c8ded2c0a656089d1f90031cfa13a8 100644
--- a/runtime/vm/object.cc
+++ b/runtime/vm/object.cc
@@ -13465,13 +13465,7 @@ intptr_t ICData::GetCountAt(intptr_t index) const {
   const Array& data = Array::Handle(ic_data());
   const intptr_t data_pos =
       index * TestEntryLength() + CountIndexFor(NumArgsTested());
-  intptr_t value = Smi::Value(Smi::RawCast(data.At(data_pos)));
-  if (value >= 0) return value;
-
-  // The counter very rarely overflows to a negative value, but if it does, we
-  // would rather just reset it to zero.
-  SetCountAt(index, 0);
-  return 0;
+  return Smi::Value(Smi::RawCast(data.At(data_pos)));
 }