Merge pull request #12615 from slavapestov/yay-already-fixed

Add a regression test for rdar://problem/35088384

Author: slavapestov

validation-test/compiler_crashers_2_fixed/0128-rdar35088384.swift

@@ -0,0 +1,12 @@
+// RUN: %swift-target-frontend -typecheck -verify %s
+
+protocol Command {}
+
+struct A : Command {}
+struct B : Command {}
+
+// This used to crash in Xcode 9 GM, and fails with a diagnostic in more
+// recent swift-4.0-branch builds, because we incorrectly infer the type
+// of the array literal as [Any].
+
+let a = Array<Command.Type>([A.self, B.self])