+Due to a bleadperl optimization (Dave Mitchell, circa apr 04), the
+(map|grep)(start|while) opcodes have different flags in 5.9, their
+private flags /1, /2 are gone in blead (for the cases covered)
+
+When the optree stuff was integrated into 5.8.6, these tests failed,
+and were todo'd. They're now done, by version-specific tweaking in
+mkCheckRex(), therefore the skip is removed too.