6618886: Anonymous objects can be destructed immediately and so should not be used

Reviewed-by: dholmes, kamg

src/os/solaris/vm/osThread_solaris.cpp

@@ -71,7 +71,7 @@ static intptr_t compare_and_exchange_current_callback (
   if (VM_Version::supports_compare_and_exchange()) {
     return Atomic::cmpxchg_ptr(callback, addr, compare_value);
   } else {
-     MutexLockerEx(sync, Mutex::_no_safepoint_check_flag);
+    MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
     if (*addr == compare_value) {
       *addr = callback;
       return compare_value;
@@ -86,7 +86,7 @@ static intptr_t exchange_current_callback(intptr_t callback, intptr_t *addr, Mut
   if (VM_Version::supports_compare_and_exchange()) {
     return Atomic::xchg_ptr(callback, addr);
   } else {
-    MutexLockerEx(sync, Mutex::_no_safepoint_check_flag);
+    MutexLockerEx ml(sync, Mutex::_no_safepoint_check_flag);
     intptr_t cb = *addr;
     *addr = callback;
     return cb;