Avoid adding annotation in assumeAllMethodsMayHaveSideEffects()

This fixes failures from MainDexTracingTest.

Change-Id: Id1e77b10c3188a8f989bc2839929f74aca952cf4
diff --git a/src/test/java/com/android/tools/r8/R8TestBuilder.java b/src/test/java/com/android/tools/r8/R8TestBuilder.java
index c45de1f..ebae827 100644
--- a/src/test/java/com/android/tools/r8/R8TestBuilder.java
+++ b/src/test/java/com/android/tools/r8/R8TestBuilder.java
@@ -505,8 +505,7 @@
   }
 
   public T assumeAllMethodsMayHaveSideEffects() {
-    return addSideEffectAnnotations()
-        .addInternalKeepRules("-assumemayhavesideeffects class * { <methods>; }");
+    return addInternalKeepRules("-assumemayhavesideeffects class * { <methods>; }");
   }
 
   public T enableConstantArgumentAnnotations() {