In GrowMode, force the value to the right representation to avoid deopts between storing the length…

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index a596873d09e040c33ceea997bf430d6852b4e0de..a12e92178a2bb6111c116fec95291f75d819b9d0 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -6972,19 +6972,26 @@ class HStoreKeyed V8_FINAL
     }
 
     ASSERT_EQ(index, 2);
-    if (IsDoubleOrFloatElementsKind(elements_kind())) {
+    return RequiredValueRepresentation(elements_kind_, store_mode_);
+  }
+
+  static Representation RequiredValueRepresentation(
+      ElementsKind kind, StoreFieldOrKeyedMode mode) {
+    if (IsDoubleOrFloatElementsKind(kind)) {
       return Representation::Double();
     }
-    if (SmiValuesAre32Bits() && store_mode_ == STORE_TO_INITIALIZED_ENTRY) {
-      return Representation::Integer32();
-    }
-    if (IsFastSmiElementsKind(elements_kind())) {
+
+    if (IsFastSmiElementsKind(kind)) {
+      if (SmiValuesAre32Bits() && mode == STORE_TO_INITIALIZED_ENTRY) {
+        return Representation::Integer32();
+      }
       return Representation::Smi();
     }
 
-    return is_external() || is_fixed_typed_array()
-        ? Representation::Integer32()
-        : Representation::Tagged();
+    return IsExternalArrayElementsKind(kind) ||
+                   IsFixedTypedArrayElementsKind(kind)
+               ? Representation::Integer32()
+               : Representation::Tagged();
   }
 
   bool is_external() const {