Merge pull request #1213 from practicalswift/swiftc-28249-swift-typechecker-validategenericfuncsignature

[swiftc] Add test case for crash triggered in swift::TypeChecker::validateGenericFuncSignature(…)

Author: lattner

validation-test/compiler_crashers/28249-swift-typechecker-validategenericfuncsignature.swift

@@ -0,0 +1,9 @@
+// RUN: not --crash %target-swift-frontend %s -parse
+// REQUIRES: asserts
+
+// Distributed under the terms of the MIT license
+// Test case submitted to project by https://github.com/practicalswift (practicalswift)
+// Test case found by fuzzing
+
+class S<T:S{func g:T.g
+func g