| Regression test for b/140507091: Check that an explicit null check is | |
| emitted for a volatile field load on ARM64 at the beginning of the | |
| Baker read barrier thunk, so that a null holder object is properly | |
| caught (and throws a NullPointerException as expected), instead of | |
| triggering a SIGSEGV, when the Concurrent Copying GC is in the marking | |
| phase. |