Start using new getlexstatic_o op.
Fix NQP analysis of when callstatic is valid.

Makes it match Rakudo's more closely. We can cheat in NQP, but not
/that/ hard.
Update stage0 for MoarVM.

The previous bootstrap contained mis-generated code that upset a more
aggressive spesh. Furthermore, the generated code is far better these
days. Between spesh and the better stage0 (meaning we build stage 1
faster), the NQP build is now down to 41s (from around 50s) for me.
Merge remote-tracking branch 'origin/master' into lexopts
Bump to latest Moar for improved spesh, new lex op
Make sure we callstatic the NQPCORE.setting subs.
Merge branch 'master' of github.com:perl6/nqp into loop_labels