tree 910c2c88e0c920419f8c8ec6a7eaf1206efa3537
parent 28490baa523f124ce8cec3d62221e2cc9ad8797a
author mostang.com!davidm <mostang.com!davidm> 1043170880 +0000
committer mostang.com!davidm <mostang.com!davidm> 1043170880 +0000

Support register-backing-store switching.  This should make unwinding across signals
delivered on alternate signal stack work.  More testing is needed, but the code should
be complete.

BKrev: 3e2d8640dkwvw3HFk-yQoXqN3nmYaA