Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Amend r228781 by also disabling -Warray-bounds warnings for the asr
module.

MFC after: 1 week

MFtbemd:

Use MACHINE_CPUARCH in preference to MACHINE_ARCH. The former is the
source code location of the machine, the latter the binary output. In
general, we want to use MACHINE_CPUARCH instead of MACHINE_ARCH unless
we're tesitng for a specific target. The isn't even moot for
i386/amd64 where there's momemntum towards a MACHINE_CPUARCH == x86,
although a specific cleanup for that likely would be needed...

Remove Alpha remnants.

Unbreak buildworld on i386 when MODULES_WITH_WORLD is defined.

Fix the build. opt_asr.h is gone.

Beer or equivalent to? njl

Make an attempt to get the asr driver to compile on Alpha by fixing some i386
specific bogons. Compile with -O0, as anything higher gives the compiler
a fit. No idea if this driver will actually work on Alpha, though.

Use a consistent style and one much closer to the rest of /usr/src

Add the 'asr' driver, supplied by Mark Salyzyn of Adaptec (nee DPT).
This provides support for the Adaptec SCSI RAID controller family,
as well as the DPT SmartRAID V and VI families.

The driver will be maintained by Mark and Adaptec, and any changes
should be referred to the MAINTAINER.