Disable partial rewriting of phis in split branch optimizer

Bug: b/334275655
Change-Id: I4784cf4059acecef7d3b97afcfbbb8058894e116
diff --git a/src/main/java/com/android/tools/r8/ir/conversion/passes/SplitBranch.java b/src/main/java/com/android/tools/r8/ir/conversion/passes/SplitBranch.java
index c8455fc..c425cb7 100644
--- a/src/main/java/com/android/tools/r8/ir/conversion/passes/SplitBranch.java
+++ b/src/main/java/com/android/tools/r8/ir/conversion/passes/SplitBranch.java
@@ -27,7 +27,7 @@
 
 public class SplitBranch extends CodeRewriterPass<AppInfo> {
 
-  private static final boolean ALLOW_PARTIAL_REWRITE = true;
+  private static final boolean ALLOW_PARTIAL_REWRITE = false;
 
   public SplitBranch(AppView<?> appView) {
     super(appView);