Revert "Windows AArch64 safefetch implementation should not use structured exception handling"

This reverts commit 62651d6.

Author: swesonga

src/hotspot/os/windows/os_windows.cpp

@@ -2729,10 +2729,6 @@ LONG WINAPI topLevelExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo) {
     // Verify that OS save/restore AVX registers.
     return Handle_Exception(exceptionInfo, VM_Version::cpuinfo_cont_addr());
   }
-#elif defined(_M_ARM64)
-  if (handle_safefetch(exception_code, pc, (void*)exceptionInfo->ContextRecord)) {
-    return EXCEPTION_CONTINUE_EXECUTION;
-  }
 #endif
 
   if (t != nullptr && t->is_Java_thread()) {

src/hotspot/os/windows/os_windows.hpp

@@ -172,8 +172,6 @@ class os::win32 {
   // signal support
   static void* install_signal_handler(int sig, signal_handler_t handler);
   static void* user_handler();
-
-  static void context_set_pc(CONTEXT* uc, address pc);
 };
 
 #endif // OS_WINDOWS_OS_WINDOWS_HPP

src/hotspot/os/windows/safefetch_static_windows.cpp

@@ -99,10 +99,6 @@ frame os::fetch_frame_from_context(const void* ucVoid) {
   return frame(sp, fp, epc);
 }
 
-void os::win32::context_set_pc(CONTEXT* uc, address pc) {
-  uc->Pc = (intptr_t)pc;
-}
-
 bool os::win32::get_frame_at_stack_banging_point(JavaThread* thread,
         struct _EXCEPTION_POINTERS* exceptionInfo, address pc, frame* fr) {
   PEXCEPTION_RECORD exceptionRecord = exceptionInfo->ExceptionRecord;

src/hotspot/os_cpu/windows_aarch64/os_windows_aarch64.cpp

@@ -31,7 +31,7 @@
 // Safefetch allows to load a value from a location that's not known
 // to be valid. If the load causes a fault, the error value is returned.
 
-#if defined(_WIN32) && !defined(_M_ARM64)
+#ifdef _WIN32
   // Windows uses Structured Exception Handling
   #include "safefetch_windows.hpp"
 #elif defined(ZERO) || defined (_AIX)