Add a crasher

Author: slavapestov

validation-test/compiler_crashers_2/0130-sr5013.swift

@@ -0,0 +1,12 @@
+// RUN: not --crash %target-swift-frontend -typecheck %s
+// REQUIRES: asserts
+
+protocol A {
+    associatedtype B
+}
+
+extension A {
+    func foo() {
+        (B.self as! Sequence.Type).Element
+    }
+}