Integrate mainline

p4raw-id: //depot/perlio@14295

diff --cc embed.fnc
index a9d1dcc,2388e32..cf8f891
--- 1/embed.fnc
--- 2/embed.fnc
+++ b/embed.fnc
@@@ -1009,7 -1009,7 +1009,7 @@@ s       |void   |apply_attrs    |HV *stash|SV *tar
  s     |void   |apply_attrs_my |HV *stash|OP *target|OP *attrs|OP **imopsp
  #  if defined(PL_OP_SLAB_ALLOC)
  s     |void*  |Slab_Alloc     |int m|size_t sz
- s     |void   |Slab_Free      |void *
 -s      |void   |Slab_Free      |void *op
++s     |void   |Slab_Free      |void *op
  #  endif
  #endif