MFC r275376:

  Allow multiple devices to mmap.  It's impossible to prevent this with
  checks on the open/close functions.
Fix the following -Werror warning from clang 3.5.0, while building
lib/libngatm:

sys/contrib/ngatm/netnatm/saal/saal_sscop.c:4030:32: error: 'break' is bound to current loop, GCC binds it to the enclosing loop [-Werror,-Wgcc-compat]
                } while(sn < sscop->vr_h && !QFIND(&sscop->rbuf, sn));
                                             ^
sys/contrib/ngatm/netnatm/saal/saal_sscop.c:173:4: note: expanded from macro 'QFIND'
                        break;                                          \
                        ^
1 error generated.

The idea is to remove any ambiguity by replacing the macro with an
equivalent static inline function.

Reviewed by:	emaste, rpaulo
See also:	http://reviews.llvm.org/D2518
Differential Revision: https://reviews.freebsd.org/D1188
Shrink boot2 a bit more by factoring out common pattern
of printf();return(-1);

This shrinks it by 8bytes using clang35 and by 12bytes using clang34.
MFi386: r275237 (by rdivacky)

  Shrink boot2 a bit more by factoring out common pattern
  of printf();return(-1);
Shrink boot2 by a couple more bytes.

Reviewed by:    jhb
Tested by:      me, dim
MFi386: r275059, r275061, r275062 and r275191 (by rdivacky)

  Shrink boot2 by a couple more bytes.
Fix the following -Werror warning from clang 3.5.0, while building cddl/lib/libctf:

In file included from cddl/contrib/opensolaris/common/ctf/ctf_create.c:31:
In file included from sys/cddl/contrib/opensolaris/uts/common/sys/sysmacros.h:34:
sys/cddl/contrib/opensolaris/uts/common/sys/isa_defs.h:334:9: warning: '_ILP32' macro redefined [-Wmacro-redefined]
#define _ILP32
        ^
<built-in>:26:9: note: previous definition is here
#define _ILP32 1
        ^
1 warning generated.

This is because clang 3.5.0 started predefining _ILP32 and __ILP32__ for
the i386 arch.  (Earlier versions already predefined _LP64 and __LP64__
for the x86_64 arch.)

Reviewed by:	emaste, avg, smh, delphij, markj
Differential Revision: https://reviews.freebsd.org/D1187
Merge clang 3.5.0