Handle single element array growth + transition in generic KeyedStoreIC

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index 90b0790796a031cb183b230d79aa161777fe4938..b5ba32d21db1dd8a9fb8335670a8b1810b43a35f 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1123,10 +1123,21 @@ class MacroAssembler: public Assembler {
   // Find the function context up the context chain.
   void LoadContext(Register dst, int context_chain_length);
 
-  // Load the initial map for new Arrays of a given type.
-  void LoadGlobalInitialConstructedArrayMap(Register function_in,
-                                            Register scratch,
-                                            Register map_out);
+  // Conditionally load the cached Array transitioned map of type
+  // transitioned_kind from the global context if the map in register
+  // map_in_out is the cached Array map in the global context of
+  // expected_kind.
+  void LoadTransitionedArrayMapConditional(
+      ElementsKind expected_kind,
+      ElementsKind transitioned_kind,
+      Register map_in_out,
+      Register scratch,
+      Label* no_map_match);
+
+  // Load the initial map for new Arrays from a JSFunction.
+  void LoadInitialArrayMap(Register function_in,
+                           Register scratch,
+                           Register map_out);
 
   // Load the global function with the given index.
   void LoadGlobalFunction(int index, Register function);