AVX

[Kostik Belousov]

The patch
http://people.freebsd.org/~kib/misc/avx.2.patch
is the commit candidate. Compared with avx.1.patch, it includes
several bugfixes, some move of code around, and finishes the
implementation of getcontextx(3) for non-x86 architectures.

Please note that variant of getcontextx() is required for deferred
signal delivery from libthr. This is the reason for Cc:ing sparc64@,
could somebody test the patch on this architecture ? I used the
http://people.freebsd.org/~kib/misc/defer_sig.c to test deferred
delivery on amd64.

Another missed testing point is machines capable of XSAVE but lacking
AVX extensions. I think most Core2 fall into this category, but my Core2
machine is disassembled. Could anybody test the patch on non-SandyBridge
machine having XSAVE support ? You can check the capability using
ports/sysutils/x86info or looking at the early boot Features2 line,
which shall contain the XSAVE.
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