Merge pull request #1671 from gregomni/typealias

My last commit a11e911 accidentally fixed this recently added crash.

Author: gregomni

validation-test/compiler_crashers/28268-swift-type-transform.swift renamed to validation-test/compiler_crashers_fixed/28268-swift-type-transform.swift

@@ -5,7 +5,6 @@
 // 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
+// RUN: not %target-swift-frontend %s -parse
 var:{protocol a{struct A:a
 typealias e=A.e