Add regression test for recently-fixed crasher

Author: slavapestov

validation-test/compiler_crashers_2_fixed/sr13982.swift

@@ -0,0 +1,11 @@
+// RUN: not %target-swift-frontend -emit-ir %s
+
+public protocol ProtoDelegate where Self.Manager.Delegate: Self {
+  associatedtype Manager: ProtoManager
+  func bind(to: Manager)
+}
+
+public protocol ProtoManager where Self.Delegate.Manager: Self {
+  associatedtype Delegate: ProtoDelegate
+  var name: String { get }
+}