Reuse canonicalized type for receiver type if class is not signature class and has no type paramete…

runtime/vm/parser.cc

Index: runtime/vm/parser.cc
diff --git a/runtime/vm/parser.cc b/runtime/vm/parser.cc
index ed49a3ccf32951909966398f40713e130128282e..a8d9795b1362a39303cd0b6c99f1a762c960d7bc 100644
--- a/runtime/vm/parser.cc
+++ b/runtime/vm/parser.cc
@@ -11859,12 +11859,17 @@ bool Parser::ParsingStaticMember() const {
 
 const AbstractType* Parser::ReceiverType(const Class& cls) {
   ASSERT(!cls.IsNull());
-  const TypeArguments& type_arguments = TypeArguments::Handle(
-      Z,
+  AbstractType& type = AbstractType::ZoneHandle(Z, cls.CanonicalType());
+  if (!type.IsNull()) {
+    // This requirement is embedded in 'CanonicalType' function.
+    ASSERT((cls.NumTypeArguments() == 0) && !cls.IsSignatureClass());
+    return &type;
+  }
+
+  const TypeArguments& type_arguments = TypeArguments::Handle(Z,
       (cls.NumTypeParameters() > 0) ?
           cls.type_parameters() : TypeArguments::null());
-  AbstractType& type = AbstractType::ZoneHandle(
-      Z, Type::New(cls, type_arguments, cls.token_pos()));
+  type = Type::New(cls, type_arguments, cls.token_pos());
   if (cls.is_type_finalized()) {
     type ^= ClassFinalizer::FinalizeType(
         cls, type, ClassFinalizer::kCanonicalizeWellFormed);