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, 1 insertions, 0 deletions

diff --git a/embed.pl b/embed.pl
index 50da23207d..0287c858f3 100755
--- a/embed.pl
+++ b/embed.pl
@@ -696,6 +696,7 @@ print $em do_not_edit ("embedvar.h"), <<'END';
 END
 
 for $sym (sort keys %intrp) {
+    next if $sym eq 'bitcount';
     print $em multon($sym,'I','vTHX->');
 }