Take enable-testing into account when computing whether a class has resilient metadata

rdar://87617621

Author: aschwaighofer

lib/AST/Decl.cpp

@@ -4396,8 +4396,7 @@ bool ClassDecl::hasResilientMetadata() const {
     return false;
 
   // If the class is not public, we can't use it outside the module at all.
-  if (!getFormalAccessScope(/*useDC=*/nullptr,
-                            /*treatUsableFromInlineAsPublic=*/true).isPublic())
+  if (getEffectiveAccess() < AccessLevel::Public)
     return false;
 
   // Otherwise we access metadata members, such as vtable entries, resiliently.

test/IRGen/Inputs/resilient-class.swift

@@ -0,0 +1,7 @@
+open class Base {
+    var x = 1
+}
+
+internal class SubClass : Base {
+    var y = 2
+}

test/IRGen/testing-enabled-resilient-super-class.swift

@@ -0,0 +1,11 @@
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend -enable-testing -emit-ir -enable-library-evolution -module-name=resilient %S/Inputs/resilient-class.swift | %FileCheck %s
+
+@testable import resilient
+
+// CHECK: s9resilient8SubClassCMo
+
+public func testCase() {
+  let t = SubClass()
+  print(t.y)
+}