Request for reviews (XS): 7012339: JSR 292 crash in G1SATBCardTableModRefBS::write_ref_field_pre_work()

[Christian Thalinger]

http://cr.openjdk.java.net/~twisti/7012339/webrev.01/

7012339: JSR 292 crash in G1SATBCardTableModRefBS::write_ref_field_pre_work()
Reviewed-by:

The cast of &_f1 to HeapWord* in
ConstantPoolCacheEntry::set_f1_if_null_atomic leads to the wrong
version of update_barrier_set_pre.

The fix is to cast &_f1 to oop*.

Thanks to John Cuthbertson who actually told me what's going
wrong.