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author	David Mitchell <davem@iabyn.com>
	Thu, 24 Nov 2016 09:40:44 +0000 (09:40 +0000)
committer	David Mitchell <davem@iabyn.com>
	Thu, 24 Nov 2016 13:42:22 +0000 (13:42 +0000)
commit	e03e82a04dda6a44b815f3367c69afb0e953dc91
tree	0af20bb6d6d86cda9bedc1c62ebcacde194e382a	tree \| snapshot
parent	d24e3eb1402c1294265f99342e2ec0ecfd0f5d34	commit \| diff

add sv_set_undef() API function

This function is equivalent to sv_setsv(sv, &PL_sv_undef), but more
efficient.

Also change the obvious places in the core to use the new idiom.

embed.fnc		diff \| blob \| blame \| history
embed.h		diff \| blob \| blame \| history
mg.c		diff \| blob \| blame \| history
pod/perldelta.pod		diff \| blob \| blame \| history
pp.c		diff \| blob \| blame \| history
pp_hot.c		diff \| blob \| blame \| history
proto.h		diff \| blob \| blame \| history
regcomp.c		diff \| blob \| blame \| history
sv.c		diff \| blob \| blame \| history
t/perf/benchmarks		diff \| blob \| blame \| history
util.c		diff \| blob \| blame \| history

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