Remove the unused LoadInitialArrayMap.

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 092acc027866c2fe4945590d30557a0ee991b19f..5efa2d921270874206fe8674e008222aa9bf4f63 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1234,12 +1234,6 @@ class MacroAssembler: public Assembler {
       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,
-                           bool can_have_holes);
-
   // Load the global function with the given index.
   void LoadGlobalFunction(int index, Register function);
   void LoadArrayFunction(Register function);