8254940: AArch64: Cleanup non-product thread members

Reviewed-by: aph

Author: AntonKozlov

src/hotspot/os_cpu/linux_aarch64/thread_linux_aarch64.hpp

@@ -27,15 +27,6 @@
 #define OS_CPU_LINUX_AARCH64_THREAD_LINUX_AARCH64_HPP
 
  private:
-#ifdef ASSERT
-  // spill stack holds N callee-save registers at each Java call and
-  // grows downwards towards limit
-  // we need limit to check we have space for a spill and base so we
-  // can identify all live spill frames at GC (eventually)
-  address          _spill_stack;
-  address          _spill_stack_base;
-  address          _spill_stack_limit;
-#endif // ASSERT
 
   void pd_initialize() {
     _anchor.clear();

src/hotspot/os_cpu/windows_aarch64/thread_windows_aarch64.hpp

@@ -27,16 +27,6 @@
 
  private:
 
-#ifdef ASSERT
-  // spill stack holds N callee-save registers at each Java call and
-  // grows downwards towards limit
-  // we need limit to check we have space for a spill and base so we
-  // can identify all live spill frames at GC (eventually)
-  address          _spill_stack;
-  address          _spill_stack_base;
-  address          _spill_stack_limit;
-#endif // ASSERT
-
   void pd_initialize() {
     _anchor.clear();
   }