K 10
svn:author
V 2
ae
K 8
svn:date
V 27
2015-12-10T10:35:07.538316Z
K 7
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V 302
Make detection of GPT a bit more reliable.

When we are detecting a partition table and didn't find PMBR, try to
read backup GPT header from the last sector and if it is correct,
assume that we have GPT.

Reviewed by:	rpokala
MFC after:	1 month
Differential Revision:	https://reviews.freebsd.org/D4282

END