[test] Don't run still-crashing compiler_crashers under no-asserts builds.

Per discussion on the list. From now on, when you fix a compiler_crashers
test case, move it to compiler_crashers_fixed so that we get no-asserts and
ASan coverage.

Swift SVN r27055

validation-test/compiler_crashers_fixed/2257-swift-any-from-nsmutablearray.swift

@@ -0,0 +1,10 @@
+// RUN: %target-swift-frontend %s -emit-ir
+
+// REQUIRES: objc_interop
+
+// Distributed under the terms of the MIT license
+// Test case submitted to project by https://github.com/mattdaw (Matt Daw)
+
+import Foundation
+var a: NSMutableArray = [""]
+var b: Any = a[0]