Move fixed todo from run/todo.t to re/pat_advanced

I changed the description, because looking at the ticket, it caused a
segfault; more serious than an assertion failure.

Author: khwilliamson

t/re/pat_advanced.t

@@ -2713,6 +2713,16 @@ EOF_DEBUG_OUT
         $x =~ s/^[\x{0301}\x{030C}]+//;
     }
 
+    {   # GH 16627
+        fresh_perl('use re "eval";
+                    my @r;
+                    for $0 (qw(0 0)) {
+                        push @r, qr/@r(?{})/;
+                    }',
+                   { stderr => 'devnull' });
+        is($?, 0, "No segfault; [GH 16627]");
+    }
+
 
     # !!! NOTE that tests that aren't at all likely to crash perl should go
     # a ways above, above these last ones.  There's a comment there that, like

t/run/todo.t

@@ -181,12 +181,4 @@ TODO: {
 
 }
 
-{
-    fresh_perl('use re "eval";
-                my @r;
-                for$0(qw(0 0)){push@r,qr/@r(?{})/};',
-               { stderr => 'devnull' });
-    is($?, 0, "No assertion failure");
-}
-
 done_testing();