Replace run-time on-demand initialisation of PL_bitcount with a constant table.

(The table is 256 bytes; the run-time initialisation code is larger than this!)
Adapt generate_uudmap.c to generate the initalisation block for PL_bitcount,
writing the code to bitcount.h, using the same approach as uudmap.h.

To preserve binary compatibility:
for MULTIPLICITY:
  keep Ibitcount in the interpreter structure, but remove all the macros that
  access it. PL_bitcount is a new symbol in the object file, which won't clash
  with anything as that name wasn't used before.
otherwise:
  keep PL_bitcount as a char *, but initialise it at compile time to a new
  constant array PL_bitcount array. Remove the code that attempts to Safefree()
  it at interpreter destruction time.

1 files changed, 8 insertions, 0 deletions

diff --git a/intrpvar.h b/intrpvar.h
index 504a056990..487576a8c9 100644
--- a/intrpvar.h
+++ b/intrpvar.h
@@ -533,7 +533,15 @@ PERLVARI(Iglob_index,	int,	0)
 
 PERLVAR(Iparser,	yy_parser *)	/* current parser state */
 
+#ifdef MULTIPLICITY
+/* For binary compatibility, keep the interpreter structure the same.
+   However, we no longer use this entry.  */
 PERLVAR(Ibitcount,	char *)
+#else
+/* For binary compatibility, need to retain an extern char *PL_bitcount.
+   So make it point to the compile time generated array.  */
+PERLVARI(Ibitcount,	char *, (char *)PL_bitcount_array)
+#endif
 
 /* Array of signal handlers, indexed by signal number, through which the C
    signal handler dispatches.  */