Tests previously breaking on bc524 now just work.

These all appear to be PAD related. Since we're saving the PAD statically with an immortal flag, we're not having issues any more.

#26
rurban#219
rurban#277

t/v5.24.1/C-COMPILED/known_errors.txt

@@ -32,7 +32,6 @@ io/bom.t                    COMPAT    BC issue 312 - BOM seems to be rejected by
 io/layers.t                 SKIP      This is a known BC issue we've never cared about. use open doesn't work. See https://code.google.com/p/perl-compiler/issues/detail?id=203
 io/open.t                   TESTS     BC issue #219 (overload) - new tests in upstream since 5.14.4
 mro/overload_c3_utf8.t      TESTS     BC issue #219 - overload issue
-mro/overload_dfs.t          TESTS     BC issue #219 - overload issue
 mro/package_aliases_utf8.t  SKIP      Runs REAALY slow and many of the failures are already reported. Waiting for other BC issues to clear before researching this one.
 op/attrhand.t               PLAN      BC issue #271 - Attribute::Handlers
 op/blocks.t                 COMPAT    check order of execution of special blocks ( BEGIN included )
@@ -42,7 +41,6 @@ op/const-optree.t           PLAN      BC issue #305 - feature refaliasing
 op/coreamp.t                COMPAT    unsupported experimental::lexical_topic + BC issue #219 - overload issue
 op/coresubs.t               COMPAT    uses B::walkoptree
 op/eval.t                   SKIP      TODO: infinite loop while running the binary + BC issue #219 - overload issue
-op/exists_sub.t             SIG       BC issue #277 - empty sub with attributes
 op/glob.t                   SKIP      Occasional Flapper. Waiting for more BC issues to pass before we address it.
 op/goto_xs.t                COMPAT    needs XS::APItest
 op/lex.t                    COMPAT    Tests trigger errors at compilation time
@@ -71,7 +69,6 @@ re/pat_re_eval.t            PLAN      BC issue #219 - overload issue
 re/pat_rt_report.t          TESTS     BC issue #317 - nested Regex
 re/qr_gc.t                  TESTS     BC issue #309 - regexp destruction
 re/reg_eval_scope.t         PLAN      BC issue #295 - (?{}) should have its own lexical scope
-re/reg_mesg.t               TESTS     CM issue #26 - warnings from re.pm - Subroutine redefined
 re/reg_pmod.t               TESTS     BC issue #295 - (?{}) should have its own lexical scope
 re/rxcode.t                 TESTS     BC issue #295 - (?{}) should have its own lexical scope
 re/subst_amp.t              TESTS     BC issue #295 - (?{}) should have its own lexical scope