Allow inlined 86ctors
Summary: These are basically NOPs, so we should probably inline them (if you
declare an empty constructor it gets inlined). Also updates some state tracking
to record FPushCtorD frames.
I didn't see much of a change in perlab but this seems like something we might
want to do anyway.
https://our.intern.facebook.com/intern/perflab/details/910450
https://our.intern.facebook.com/intern/perflab/details/910452
https://our.intern.facebook.com/intern/perflab/details/910453
Reviewed By: @jdelong
Differential Revision:
D1540133