Reapply change to hide VM-only List implementation classes.

runtime/vm/intrinsifier.cc

Index: runtime/vm/intrinsifier.cc
diff --git a/runtime/vm/intrinsifier.cc b/runtime/vm/intrinsifier.cc
index 27e83f7415bede22723ca6cbc421de3fe75a8207..128d13115eb6d3a5d17284656ff44fb1c77964b5 100644
--- a/runtime/vm/intrinsifier.cc
+++ b/runtime/vm/intrinsifier.cc
@@ -52,6 +52,16 @@ static bool TestFunction(const Function& function,
                          const char* function_name,
                          const char* test_class_name,
                          const char* test_function_name) {
+  // If test_function_name starts with a '.' we use that to indicate
+  // that it is a named constructor in the class. Therefore, if
+  // the class matches and the rest of the method name starting with
+  // the dot matches, we have found a match.
+  if (test_function_name[0] == '.') {
+    function_name = strstr(function_name, ".");
+    if (function_name == NULL) {
+      return false;
+    }
+  }
   return CompareNames(test_class_name, function_class_name) &&
          CompareNames(test_function_name, function_name);
 }