8301337: Remove unused os::_polling_page

Reviewed-by: coleenp, dnsimon

Author: robehn

src/hotspot/share/jvmci/vmStructs_jvmci.cpp

@@ -270,8 +270,6 @@
   volatile_nonstatic_field(oopDesc,            _mark,                                         markWord)                              \
   volatile_nonstatic_field(oopDesc,            _metadata._klass,                              Klass*)                                \
                                                                                                                                      \
-  static_field(os,                             _polling_page,                                 address)                               \
-                                                                                                                                     \
   static_field(StubRoutines,                _verify_oop_count,                                jint)                                  \
                                                                                                                                      \
   static_field(StubRoutines,                _throw_delayed_StackOverflowError_entry,          address)                               \

src/hotspot/share/runtime/os.cpp

@@ -81,7 +81,6 @@
 # include <errno.h>
 
 OSThread*         os::_starting_thread    = nullptr;
-address           os::_polling_page       = nullptr;
 volatile unsigned int os::_rand_seed      = 1234567;
 int               os::_processor_count    = 0;
 int               os::_initial_active_processor_count = 0;

src/hotspot/share/runtime/os.hpp

@@ -188,7 +188,6 @@ class os: AllStatic {
 
  private:
   static OSThread*          _starting_thread;
-  static address            _polling_page;
   static PageSizes          _page_sizes;
 
   static char*  pd_reserve_memory(size_t bytes, bool executable);

src/hotspot/share/runtime/vmStructs.cpp

@@ -380,12 +380,6 @@
      static_field(CompressedKlassPointers,     _narrow_klass._base,                           address)                               \
      static_field(CompressedKlassPointers,     _narrow_klass._shift,                          int)                                   \
                                                                                                                                      \
-  /******/                                                                                                                           \
-  /* os */                                                                                                                           \
-  /******/                                                                                                                           \
-                                                                                                                                     \
-     static_field(os,                          _polling_page,                                 address)                               \
-                                                                                                                                     \
   /**********/                                                                                                                       \
   /* Memory */                                                                                                                       \
   /**********/                                                                                                                       \