Merge pull request #3511 from practicalswift/swiftc-28366-swift-archetypebuilder-finalize

[swiftc (68 vs. 5108)] Add crasher in swift::ArchetypeBuilder::finalize(...)

Author: gribozavr

validation-test/compiler_crashers/28366-swift-archetypebuilder-finalize.swift

@@ -0,0 +1,12 @@
+// 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
+extension A{{}typealias e:f
+}protocol A{struct B<T where T.E=a
+typealias e