6956931: assert(SafepointSynchronize::is_at_safepoint()) failed: must be executed at a safepoint Reviewed-by: kvn, dcubed

6957882: nsk/sajdi tests failed with NullPointerException Summary: VM.getObjectAlignmentInBytes() accesses intxType before it is created. Reviewed-by: never

6954029: Improve implicit null check generation with compressed oops Summary: Hoist DecodeN instruction above null check Reviewed-by: never, twisti

6957080: MethodComparator needs stress testing Summary: Add a stress-test flag for running MethodComparator over many inputs. Fix bugs that crop up. Reviewed-by: kvn