[Test] Add test case for SR-11600 to compiler_crashers_2_fixed

Author: theblixguy

validation-test/compiler_crashers_2_fixed/sr11600.swift

@@ -0,0 +1,13 @@
+// RUN: not %target-swift-frontend -typecheck %s
+
+@propertyWrapper struct A {
+  var wrappedValue: Int
+}
+
+@propertyWrapper struct B {
+  var wrappedValue: Int
+}
+
+struct C {
+  @A @B var foo: Int?
+}