8339882: Replace ThreadLocalStorage::thread with Thread::current_or_null in jdk8 backport of JDK-8183925

Reviewed-by: phh, andrew

Author: Ben Taylor

hotspot/src/os/posix/vm/os_posix.cpp

@@ -876,7 +876,7 @@ bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
 
   Thread::muxAcquire(&_crash_mux, "CrashProtection");
 
-  _protected_thread = ThreadLocalStorage::thread();
+  _protected_thread = Thread::current_or_null();
   assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
 
   // we cannot rely on sigsetjmp/siglongjmp to save/restore the signal mask

hotspot/src/os/windows/vm/os_windows.cpp

@@ -4890,7 +4890,7 @@ bool os::ThreadCrashProtection::call(os::CrashProtectionCallback& cb) {
 
   Thread::muxAcquire(&_crash_mux, "CrashProtection");
 
-  _protected_thread = ThreadLocalStorage::thread();
+  _protected_thread = Thread::current_or_null();
   assert(_protected_thread != NULL, "Cannot crash protect a NULL thread");
 
   bool success = true;

hotspot/src/share/vm/runtime/os.cpp

@@ -619,7 +619,7 @@ void* os::malloc(size_t size, MEMFLAGS memflags, const NativeCallStack& stack) {
 
   // Since os::malloc can be called when the libjvm.{dll,so} is
   // first loaded and we don't have a thread yet we must accept NULL also here.
-  assert(!os::ThreadCrashProtection::is_crash_protected(ThreadLocalStorage::thread()),
+  assert(!os::ThreadCrashProtection::is_crash_protected(Thread::current_or_null()),
          "malloc() not allowed when crash protection is set");
 
   if (size == 0) {