Turn DCHECKs into return false in ReplaceUninitializedStringPhis.

Until https://android-review.googlesource.com/c/platform/art/+/754691,
gets resolves, temporarily change
the method to return whether it fits the expecations, and bail
to interpreter if not.

Test: test.py
bug: 112537407
Change-Id: I60f0c3bc75f83b3b8a6c19e733c64440881a5a76
diff --git a/compiler/optimizing/ssa_builder.h b/compiler/optimizing/ssa_builder.h
index 7655445..bae15ac 100644
--- a/compiler/optimizing/ssa_builder.h
+++ b/compiler/optimizing/ssa_builder.h
@@ -123,7 +123,7 @@
   HArrayGet* GetFloatOrDoubleEquivalentOfArrayGet(HArrayGet* aget);
 
   void RemoveRedundantUninitializedStrings();
-  void ReplaceUninitializedStringPhis();
+  bool ReplaceUninitializedStringPhis();
 
   HGraph* const graph_;
   Handle<mirror::ClassLoader> class_loader_;