FFI: Allow non-scalar cdata to be compared for equality by address.
Merge branch 'master' into v2.1
Fix alias analysis for table.len vs. table.clear.
Merge branch 'v2.1' of http://luajit.org/git/luajit-2.0
UCLO fixes

* rbase is in RA, not RD
* shrink slots only if not aborting the trace

Signed-off-by: katlogic <git@git.git>