Merge pull request #3900 from practicalswift/swiftc-28381-swift-archetypebuilder-addrequirement

[swiftc (36 vs. 5154)] Add crasher in swift::ArchetypeBuilder::addRequirement(...)

Author: gribozavr

validation-test/compiler_crashers/28381-swift-archetypebuilder-addrequirement.swift

@@ -0,0 +1,14 @@
+// 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 A:a}protocol a{typealias f:a
+let t:A
+protocol A
+typealias e:a