Add a crash reproducer for rdar://85843677 (#40327)

Author: kubamracek

validation-test/Sema/type_checker_crashers_fixed/rdar85843677.swift

@@ -0,0 +1,15 @@
+// RUN: %target-typecheck-verify-swift
+
+func callClosure(closure: () -> ()) {  
+  closure()
+}
+
+callClosure {
+  struct MyStruct {
+    let s = "hello"
+    lazy var sn: String = { s }()
+  }
+  
+  let s = MyStruct()
+  print(s)
+}