cleanup for 8253457: Remove unimplemented register stack functions

Author: lewurm

src/hotspot/os_cpu/windows_aarch64/thread_windows_aarch64.hpp

@@ -48,19 +48,10 @@
   intptr_t* last_Java_fp()                       { return _anchor.last_Java_fp(); }
   void  set_last_Java_fp(intptr_t* fp)           { _anchor.set_last_Java_fp(fp);   }
 
-  void set_base_of_stack_pointer(intptr_t* base_sp) {
-  }
-
   static ByteSize last_Java_fp_offset()          {
     return byte_offset_of(JavaThread, _anchor) + JavaFrameAnchor::last_Java_fp_offset();
   }
 
-  intptr_t* base_of_stack_pointer() {
-    return NULL;
-  }
-  void record_base_of_stack_pointer() {
-  }
-
   bool pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext,
     bool isInJava);
 
@@ -73,10 +64,4 @@
      return Thread::current();
   }
 
-  // These routines are only used on cpu architectures that
-  // have separate register stacks (Itanium).
-  static bool register_stack_overflow() { return false; }
-  static void enable_register_stack_guard() {}
-  static void disable_register_stack_guard() {}
-
 #endif // OS_CPU_WINDOWS_AARCH64_THREAD_WINDOWS_AARCH64_HPP