Merge pull request #3401 from practicalswift/swiftc-28354-swift-conformancelookuptable-lookupconformances

Add 💥 (😢 → 57, 😀 → 5107) in swift::ConformanceLookupTable::lookupConformances(…)

Author: practicalswift

validation-test/compiler_crashers/28354-swift-conformancelookuptable-lookupconformances.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
+func B<T{associatedtype B<T{}class A:B<T.B>class B<T