In Perl_sv_catpv(), Perl_sv_catpv_mg() the ptr can be not NULL.

In Perl_sv_catpv(), Perl_sv_catpv_mg() the ptr can be not NULL.
In Perl_sv_inc() and Perl_sv_dec(), the sv can be not NULL.
In Perl_parser_dup() the proto parser can be NULL.
In Perl_ptr_table_find(), the sought-for pointer can be NULL.
In Perl_save_set_svflags(), the saved SV can't be NULL.

p4raw-id: //depot/perl@33283