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author	David Mitchell <davem@iabyn.com>
	Sun, 13 Nov 2016 14:59:32 +0000 (14:59 +0000)
committer	David Mitchell <davem@iabyn.com>
	Sun, 13 Nov 2016 15:27:34 +0000 (15:27 +0000)
commit	4e8879f34cd1f40280a3be7b04ebda760dcaf0f2
tree	159b5857e71a950b6ef5ff46903e6b68e994cf26	tree \| snapshot
parent	5741d7e61dd47767bf5a0fde98f3fe94c6b2f2bb	commit \| diff

reduce cost of SvVALID()

Now that SvVALID() no longer just checks an SV flag, but instead checks
for the existence of a certain type of magic, avoid using this more
expensive macro when its not really needed.

Also, and an extra flag test to SvVALID() to make it fail quicker.

gv.h		diff \| blob \| blame \| history
sv.c		diff \| blob \| blame \| history
sv.h		diff \| blob \| blame \| history
util.c		diff \| blob \| blame \| history

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