Future of armv7

Two and a half years ago when we first began talking about deprecating
32-bit architectures in 15.0, we decided to keep armv7 for at least
the stable/15 branch but did not commit to anything beyond that.  Now
that 15.0 is close to shipping and we are turning our development
focus to 16.0, we should figure out what we want to say about armv7
for 16.x in the 15.0 release notes so that users have suitable notice.

In particular, do we want to deprecate armv7 in 16.0 (similar to the
state of 32-bit powerpc in 15.0), or do we want to keep it?

My initial suggestion is that we announce that we plan to deprecate it
in 16.0.  In that case, I would also suggest that we follow a similar
process of keeping armv7 for most of the lifetime of 16.0 so that we
can reneg if need be during the 16.0 cycle.

What do other folks think?

-- 
John Baldwin