Merge pull request #4502 from practicalswift/swiftc-28403-swift-genericsignature-getsubstitutionmap

[swiftc (56 vs. 5156)] Add crasher in swift::GenericSignature::getSubstitutionMap(...)

Author: CodaFi

validation-test/compiler_crashers/28403-swift-genericsignature-getsubstitutionmap.swift

@@ -0,0 +1,17 @@
+// 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{
+protocol A{{
+}
+typealias e struct b{func a{
+enum b{
+let f=F
+class b:A class A:b