Reviewed-by: brutisso, mgerdin

Reviewed-by: jmasa, sjohanss
Contributed-by: stefan.karlsson@oracle.com, mikael.vidstedt@oracle.com

Reviewed-by: brutisso, tschatzl

Summary: Replaced the verification call to a conditional one that only runs verification in debug builds.
Reviewed-by: brutisso, tschatzl

Reviewed-by: tschatzl, jwilhelm

Summary: Null check is placed in a wrong place when storing a null to an object field on x64 with compressed oops off
Reviewed-by: roland, vlivanov, kvn

Reviewed-by: goetz, kvn, dholmes, simonis
Contributed-by: asmundak@google.com

Summary: Add reallocate functionality to ArrayAllocator and use it from BitMap::resize
Reviewed-by: brutisso, tschatzl

Reviewed-by: kvn