Merge pull request #4226 from practicalswift/swiftc-28394-swift-typechecker-checkconformance

[swiftc (47 vs. 5156)] Add crasher in swift::TypeChecker::checkConformance(...)

Author: gribozavr

validation-test/compiler_crashers/28394-swift-typechecker-checkconformance.swift

@@ -0,0 +1,10 @@
+// This source file is part of the Swift.org open source project
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+// RUN: not --crash %target-swift-frontend %s -parse
+// REQUIRES: asserts
+class d:a{let c=A}protocol a{struct A{}class S<T{}typealias e:a typealias d:a