Add a few helpers to B for INVLIST

This commit provide some basic method
to access to internal fields from one
INVLIST: SVt_INVLIST

- prev_index
- is_offset
- array_len
- get_invlist_array

This allows B::C to be walk and save invlists.

1 files changed, 1 insertions, 0 deletions

diff --git a/perl.h b/perl.h
index d0066f5168..da05d96214 100644
--- a/perl.h
+++ b/perl.h
@@ -2800,6 +2800,7 @@ typedef struct gv GV;
 typedef struct io IO;
 typedef struct context PERL_CONTEXT;
 typedef struct block BLOCK;
+typedef struct invlist INVLIST;
 
 typedef struct magic MAGIC;
 typedef struct xpv XPV;