inline.h: Change fcn name prefix from S_ to Perl_

This is being done only for those functions that don't have a guard
preventing them from being seen outside of the Perl core.

Talking to Tony Cook, we agreed that this was a good idea for two
reasons:

1) The 'Perl_' prefix does not pollute XS caller's name space.  The 'S_'
   one could be argued that it doesn't much either, but it does more so
   than 'Perl_', and the next reason is the clincher:
2) It allows us to change our minds about whether a function should be
   static inline or not, without affecting callers who use the Perl_
   form, which they would be accustomed to anyway if they're using the
   full name form.

1 files changed, 2 insertions, 2 deletions

diff --git a/pp.h b/pp.h
index d4176db9ed..17129d0e35 100644
--- a/pp.h
+++ b/pp.h
@@ -67,8 +67,8 @@ Refetch the stack pointer.  Used after a callback.  See L<perlcall>.
                 PL_markstack_ptr, (IV)*mark_stack_entry)));           \
     } STMT_END
 
-#define TOPMARK S_TOPMARK(aTHX)
-#define POPMARK S_POPMARK(aTHX)
+#define TOPMARK Perl_TOPMARK(aTHX)
+#define POPMARK Perl_POPMARK(aTHX)
 
 #define INCMARK \
     STMT_START {                                                      \