[perl #123814] replace grok_atou with grok_atoUV

Some questions and loose ends:

XXX gv.c:S_gv_magicalize - why are we using SSize_t for paren?
XXX mg.c:Perl_magic_set - need appopriate error handling for $)
XXX regcomp.c:S_reg - need to check if we do the right thing if parno
was not grokked

Perl_get_debug_opts should probably return something unsigned; not sure
if that's something we can change.

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