Description: disable UnsafeGuard in Unsafe_SetMemory0 for i386
 x86 hotspot aseembler incorrectly returns next instruction's PC
 for rep stos %eax,%es:(%edi) causing an infinite loop.
 This patch removes UnsafeGuard for i386, so that VM crashes
 instead of hanging indefinitely.
 Patch should not be forwarded as it reverses JDK-8320886 for
 i386.
Author: Vladimir Petko <vladimir.petko@canonical.com>
Bug: https://bugs.openjdk.org/browse/JDK-8335238
Forwarded: not-needed
Last-Update: 2024-07-01

--- a/src/hotspot/share/prims/unsafe.cpp
+++ b/src/hotspot/share/prims/unsafe.cpp
@@ -392,7 +392,9 @@ UNSAFE_ENTRY_SCOPED(void, Unsafe_SetMemo
   void* p = index_oop_from_field_offset_long(base, offset);
 
   {
+#if !defined(IA32) || !defined(TARGET_ARCH_x86)
     GuardUnsafeAccess guard(thread);
+#endif
     if (StubRoutines::unsafe_setmemory() != nullptr) {
       MACOS_AARCH64_ONLY(ThreadWXEnable wx(WXExec, thread));
       StubRoutines::UnsafeSetMemory_stub()(p, sz, value);