Smi arrays are only guaranteed to be initialized in non-holey case

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index fdbcff02064be23b6e4869694aa361f592f14fd8..28a56122b101d3c49aebbe45d99d17739879cb47 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6981,10 +6981,12 @@ class HStoreKeyed V8_FINAL
       return Representation::Double();
     }
 
+    if (kind == FAST_SMI_ELEMENTS && SmiValuesAre32Bits() &&
+        mode == STORE_TO_INITIALIZED_ENTRY) {
+      return Representation::Integer32();
+    }
+
     if (IsFastSmiElementsKind(kind)) {
-      if (SmiValuesAre32Bits() && mode == STORE_TO_INITIALIZED_ENTRY) {
-        return Representation::Integer32();
-      }
       return Representation::Smi();
     }