regexec.c: Add assert() to detect inconsistent ANYOF

There have been various segfaults apparently due to trying to access
the swash (and allies) portion of an ANYOF which doesn't have that.
This doesn't show up on all platforms.  The assert() should detect
this and help debugging

1 files changed, 2 insertions, 0 deletions

diff --git a/regexec.c b/regexec.c
index b9e5852cd2..69ddba5d16 100644
--- a/regexec.c
+++ b/regexec.c
@@ -6432,6 +6432,8 @@ Perl_regclass_swash(pTHX_ const regexp *prog, register const regnode* node, bool
 
     PERL_ARGS_ASSERT_REGCLASS_SWASH;
 
+    assert(ANYOF_NONBITMAP(node));
+
     if (data && data->count) {
 	const U32 n = ARG(node);