Update expectation after StringBuilder optimization fix

Bug: 216473340
Change-Id: Id7e993d63263b7dc36cbbc093ed1943dd9d961bb
diff --git a/src/test/java/com/android/tools/r8/ir/optimize/string/StringBuilderOptimizerAnalysisTest.java b/src/test/java/com/android/tools/r8/ir/optimize/string/StringBuilderOptimizerAnalysisTest.java
index 72b5887..2a81ef0 100644
--- a/src/test/java/com/android/tools/r8/ir/optimize/string/StringBuilderOptimizerAnalysisTest.java
+++ b/src/test/java/com/android/tools/r8/ir/optimize/string/StringBuilderOptimizerAnalysisTest.java
@@ -265,7 +265,7 @@
 
   @Test
   public void testPhiAtInit() {
-    int expectedNumOfNewBuilder = 2;
+    int expectedNumOfNewBuilder = 0;
     boolean expectToMeetToString = false;
     if (parameters.isDexRuntime() && parameters.getApiLevel().isLessThan(AndroidApiLevel.M)) {
       expectedNumOfNewBuilder = 1;