Store transitioned JSArray maps in global context

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 aad76bc102d7296d31aa36e344dfc9097a16f5f1..90b0790796a031cb183b230d79aa161777fe4938 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1123,6 +1123,11 @@ 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);
+
   // Load the global function with the given index.
   void LoadGlobalFunction(int index, Register function);