Fix test after removed warning.

Change-Id: I17f8965ef55995efac2bc21d1c80eb61e7423193
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/redundantfieldloadelimination/InstanceFieldLoadsSeparatedByInvokeCustomTest.java b/src/test/java/com/android/tools/r8/ir/optimize/redundantfieldloadelimination/InstanceFieldLoadsSeparatedByInvokeCustomTest.java
index 86745e5..730c399 100644
--- a/src/test/java/com/android/tools/r8/ir/optimize/redundantfieldloadelimination/InstanceFieldLoadsSeparatedByInvokeCustomTest.java
+++ b/src/test/java/com/android/tools/r8/ir/optimize/redundantfieldloadelimination/InstanceFieldLoadsSeparatedByInvokeCustomTest.java
@@ -44,7 +44,6 @@
     testForR8(parameters.getBackend())
         .addProgramClassFileData(InstanceFieldLoadsSeparatedByInvokeCustomTestClassGenerator.dump())
         .addKeepAllClassesRule()
-        .allowDiagnosticWarningMessages()
         .setMinApi(parameters.getApiLevel())
         .compile()
         .assertAllWarningMessagesMatch(containsString("Unknown bootstrap method"))