Change handling of nil value markers in template tables.HEADv2.1

Reported by Bernhard M. Wiedemann. #1348 #1155
Fixes from Peter Cawley, Christian Clason, Lewis Russell.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/lj_opt_mem.c b/src/lj_opt_mem.c
index 8cacfcfe..6f956b37 100644
--- a/src/lj_opt_mem.c
+++ b/src/lj_opt_mem.c
@@ -233,7 +233,9 @@ static TRef fwd_ahload(jit_State *J, IRRef xref)
           return lj_ir_knum_u64(J, tv->u64);
         else if (tvisint(tv))
           return lj_ir_kint(J, intV(tv));
-        else if (tvisgcv(tv))
+        else if (tvistab(tv)) /* Template table nil value marker. */
+          return TREF_NIL;
+        else if (tvisstr(tv))
           return lj_ir_kstr(J, strV(tv));
       }
       /* Othwerwise: don't intern as a constant. */