[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/0326-llvm-constantexpr-getgetelementptr.swift

@@ -0,0 +1,21 @@
+// 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/practicalswift (practicalswift)
+// rdar://18633758
+
+import Foundation
+extension NSFileManager {
+    enum C {
+    }
+    class D {
+        class var a: Dictionary<String, C> {
+            struct E {
+                static var e = Dictionary<String, C>()
+            }
+            return E.e
+        }
+    }
+}