Revert "Revert "8c34e50dc slowed down detruction with no DESTROY""

This reverts commit 95f9781bc2fad025553db0160ef9c2c5363312a1.

Now that the crash has been fixed by the preceding commit, we can
reinstate 7cc6787e9db.

1 files changed, 2 insertions, 0 deletions

diff --git a/mro.c b/mro.c
index 2d1d887fe8..be2038f4e7 100644
--- a/mro.c
+++ b/mro.c
@@ -578,6 +578,7 @@ Perl_mro_isa_changed_in(pTHX_ HV* stash)
                 revmeta->cache_gen++;
             if(revmeta->mro_nextmethod)
                 hv_clear(revmeta->mro_nextmethod);
+	    if (!SvOBJECT(revstash)) SvSTASH(revstash) = NULL;
 
 	    (void)
 	      hv_store(
@@ -1356,6 +1357,7 @@ Perl_mro_method_changed_in(pTHX_ HV *stash)
             mrometa->cache_gen++;
             if(mrometa->mro_nextmethod)
                 hv_clear(mrometa->mro_nextmethod);
+            if (!SvOBJECT(revstash)) SvSTASH(revstash) = NULL;
         }
     }