A64: Synchronize with r17525.

src/a64/macro-assembler-a64.h

Index: src/a64/macro-assembler-a64.h
diff --git a/src/a64/macro-assembler-a64.h b/src/a64/macro-assembler-a64.h
index 397d7bcd2ee995a78a0665fec1f03085daa01e7a..529976ab44699b8fa421b52dd8cc6a04a437cef7 100644
--- a/src/a64/macro-assembler-a64.h
+++ b/src/a64/macro-assembler-a64.h
@@ -1965,6 +1965,10 @@ class MacroAssembler : public Assembler {
   static bool IsCodeAgeSequence(byte* sequence);
 #endif
 
+  // Jumps to found label if a prototype map has dictionary elements.
+  void JumpIfDictionaryInPrototypeChain(Register object, Register scratch0,
+                                        Register scratch1, Label* found);
+
  private:
   // Helpers for CopyFields.
   // These each implement CopyFields in a different way.