Revert "Revert "Revert "Revert "Make sure that const-class linkage is preserved.""""

Avoid class loading triggered by verification in the
626-const-class-linking test. Expect spurious wakeups.

Add extra debugging output for a very strange failure
    image_writer.cc:1144] Check failed:
    !IsBootClassLoaderClass(as_klass)
    java.lang.Class<java.lang.NoSuchMethodError>
That class is supposed to be in the boot image (core.art for
tests), so the failing check should not be reached at all.

Test: m test-art-host
Test: m ART_TEST_OPTIMIZING=true \
        ART_TEST_JIT=true \
        ART_TEST_INTERPRETER=true \
        ART_TEST_INTERPRETER_ACCESS_CHECKS=true \
        test-art-host-run-test-626-const-class-linking
Bug: 30627598

This reverts commit 09ded9201fbeec605b12741ae255663c14bda225.

Change-Id: I65a68cb53f0707b8abb3555ac3dc44c82907aef5
diff --git a/test/626-const-class-linking/src/RacyMisbehavingHelper.java b/test/626-const-class-linking/src/RacyMisbehavingHelper.java
new file mode 100644
index 0000000..4525278
--- /dev/null
+++ b/test/626-const-class-linking/src/RacyMisbehavingHelper.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+import java.lang.reflect.Method;
+
+public class RacyMisbehavingHelper {
+    public static ClassPair get() {
+        Class<?> helper1_class = Helper1.class;
+        Class<?> test_class = Test.class;
+        try {
+            // After loading the correct class, allow loading the incorrect class.
+            ClassLoader loader = helper1_class.getClassLoader();
+            Method reportAfterLoading = loader.getClass().getDeclaredMethod("reportAfterLoading");
+            reportAfterLoading.invoke(loader);
+        } catch (Throwable t) {
+            t.printStackTrace();
+        }
+        return new ClassPair(helper1_class, test_class);
+    }
+}