Removed the wrong loop in fix for b/175332495.

Change-Id: I9a950714e763567f79f5781bab2feb9ac7135c32
diff --git a/src/main/java/com/android/tools/r8/ir/code/Value.java b/src/main/java/com/android/tools/r8/ir/code/Value.java
index 7469e3a..b25a5a1 100644
--- a/src/main/java/com/android/tools/r8/ir/code/Value.java
+++ b/src/main/java/com/android/tools/r8/ir/code/Value.java
@@ -330,8 +330,8 @@
     if (hasPhiUsers() || hasDebugUsers()) {
       return false;
     }
-    for (Phi phiUser : uniquePhiUsers()) {
-      if (phiUser.getBlock() != block) {
+    for (Instruction user : uniqueUsers()) {
+      if (user.getBlock() != block) {
         return false;
       }
     }