Integrate with Sarathy; manual resolve on regcomp.c conflicts

(Ilya's changes won).

p4raw-id: //depot/cfgperl@4468

diff --cc deb.c
Simple merge

diff --cc dump.c
Simple merge

diff --cc embed.pl
Simple merge

diff --cc mg.c
Simple merge

diff --cc op.c
Simple merge

diff --cc perl.c
Simple merge

diff --cc perl.h
Simple merge

diff --cc perlapi.c
index 99a549b,41dd32a..41dd32a
mode 100755,100644..100755
--- 1/perlapi.c
--- 2/perlapi.c
+++ b/perlapi.c

diff --cc pod/perldelta.pod
Simple merge

diff --cc pod/perldiag.pod
Simple merge

diff --cc pp.c
Simple merge

diff --cc proto.h
Simple merge

diff --cc regcomp.c
Simple merge

diff --cc sv.c
Simple merge