Support for RC and OldRC registers.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Resource Limits

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Add preliminary primop support for RC.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Types and fix some RC_MAIN in Schedule

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
RC handling for large block allocation.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Bugfix.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>
Store old RC in update frame.

Signed-off-by: Edward Z. Yang <ezyang@mit.edu>