8031818: Experimental VM flag for enforcing safe object construction Summary: -XX:+AlwaysSafeConstructors to unconditionally emit the trailing constructor barrier. Reviewed-by: kvn, roland

8033380: Experimental VM flag to enforce access atomicity Summary: -XX:+AlwaysAtomicAccesses to unconditionally enforce the access atomicity. Reviewed-by: roland, kvn, iveresov

8007270: Make IsMethodCompilable test work with tiered Summary: Only c2 compiles counts toward cutoff Reviewed-by: kvn, roland