[strong] Implement strong mode semantics for the count operation.

src/runtime/runtime.h

Index: src/runtime/runtime.h
diff --git a/src/runtime/runtime.h b/src/runtime/runtime.h
index 2b51e072e74fc0468038403e5e04e7fa73574e93..014af0df135e7f8d8ae75cce9223c4f28970cc75 100644
--- a/src/runtime/runtime.h
+++ b/src/runtime/runtime.h
@@ -300,6 +300,7 @@ namespace internal {
   F(NewSyntaxError, 2, 1)                     \
   F(NewReferenceError, 2, 1)                  \
   F(ThrowIteratorResultNotAnObject, 1, 1)     \
+  F(ThrowStrongModeImplicitConversion, 0, 1)  \
   F(PromiseRejectEvent, 3, 1)                 \
   F(PromiseRevokeReject, 1, 1)                \
   F(PromiseHasHandlerSymbol, 0, 1)            \