K 10
svn:author
V 3
pfg
K 8
svn:date
V 27
2018-01-21T20:27:47.720327Z
K 7
svn:log
V 524
Define a new __alloc_size2 attribute to complement the exiting support.

At least on GCC7 calling __alloc_size(x) twice is not equivalent to
calling using the attribute once with two arguments. The later is the
documented use in GCC documentation so add a new alloc_size(n, x)
alternative to cover for the few places where it is used: basically:
calloc(3), reallocarray(3) and  mallocarray(9).

Submitted by:	Mark Millard
MFC after:	3 days
Reference:
http://docs.freebsd.org/cgi/mid.cgi?F227842D-6BE2-4680-82E7-07906AF61CD7

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