tmp fix for Bleadperl breaks Variable-Magic

RT #128989

Prior to my commit v5.25.3-266-g1d7e644, in the absence of the SVs_RMG
flag, av_fetch() used AvFILL() for -ve keys and AvFILLp() for positive
keys. That commit changed it so they both use AvFILLp. This has broken
Variable::Magic 0.59.

As an interim measure, restore the old behaviour.

1 files changed, 2 insertions, 1 deletions

diff --git a/av.c b/av.c
index 21828a9254..e3c6d5a37c 100644
--- a/av.c
+++ b/av.c
@@ -272,7 +272,8 @@ Perl_av_fetch(pTHX_ AV *av, SSize_t key, I32 lval)
     }
 
     neg  = (key < 0);
-    size = AvFILLp(av) + 1;
+    /* XXX tmp restore old behaviour to make Variable::Magic pass */
+    size = (neg ? AvFILL(av): AvFILLp(av)) + 1;
     key += neg * size; /* handle negative index without using branch */
 
     /* the cast from SSize_t to Size_t allows both (key < 0) and (key >= size)