[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/1995-swift-constraints-constraintsystem-solve.swift

@@ -0,0 +1,30 @@
+// RUN: not %target-swift-frontend %s -parse
+
+// Distributed under the terms of the MIT license
+// Test case submitted to project by https://github.com/practicalswift (practicalswift)
+// Test case found by fuzzing
+
+func f() {
+return g<T] = D> Any, A {
+}
+typealias e():Any) {
+struct X.A<h> String {
+let i<U -> Bool {
+}
+}
+class a(Any) {
+func f.f == b: a {
+}
+d.init(A<h : String {
+}
+}
+convenience init(Any) {
+}
+}
+return nil
+struct c<d = b: B? {
+convenience init() {
+class A : d<T>, f<e(T) -> {
+}
+var b(t: A {
+class B : Int