Some fixups to pf_get_sport after r257223:

- Do not return blindly if proto isn't ICMP.
- The dport is in network order, so fix comparisons.
- Remove ridiculous htonl(arc4random()).
- Push local variable to a narrower block.
x86: Allow users to change PSL_RF via ptrace(PT_SETREGS...)

Debuggers may need to change PSL_RF.  Note that tf_eflags is already stored
in the signal context during signal handling and PSL_RF previously could be
modified via sigreturn, so this change should not provide any new ability
to userspace.

For background see the thread at:
http://lists.freebsd.org/pipermail/freebsd-i386/2007-September/005910.html

Reviewed by:	jhb, kib
Sponsored by:	DARPA, AFRL
Introduce allocation cache to store LZ4 compression contexts without kicking
VM subsystem twice for every written record.

Tests on 24-core system show double reduction of CPU time spent on copying
single large well-compressed file.

This patch is not really needed on illumos (while not harm either) since
their memory allocator by default uses caching for all requests up to 128K.

Reviewed by:	Saso Kiselkov <skiselkov.ml@gmail.com>
gcc: merge rs6000 change from FSF pre-gcc43

config/rs6000/rs6000.c
http://gcc.gnu.org/ml/gcc-patches/2007-04/msg01551.html
Don't set MASK_PPC_GFXOPT for 8540 or 8548.

Obtained from:	gcc 4.3 (rev. 124381; GPLv2)
MFC after:	3 weeks
Reviewed by:	nathan
Repair build after svn r258115

options.get_size_type() appears to return a const char *, so assume that
its a string as oppose to *nothing*.  I have no idea what apple's code is
trying to do here:

http://opensource.apple.com/source/gperf/gperf-9/patches/size_type.patch
The previous code makes a memory allocation in size of
struct mbx_common_read_write_flashrom plus 32KB and caps the actual
transfer size at 32KB.  This is harmless as it is but may confuse
static code analyzer, so allocate a full 32KB instead.

Reported by:	Coverity via mjacob
Submitted by:	Venkata Duvvuru <VenkatKumar.Duvvuru Emulex Com>
Coverity CID:	1125820
The FreeBSD Project now has its own, Ogranizationally Unique Identifier,
assigned by the IEEE.  This file includes documentation on how developers
must carve up the space as well as an initial allocation for bhyve.

Sponsored by:	The FreeBSD Foundation
Shift our OUI correctly.

Pointed out by: emaste
Merge vrp-tree fix from gcc-4.3

Fix missed conversion from / to >> (GCC PR32521)

Note that vrp-tree is currently disabled by default in
FreeBSD's gcc due many bugs.

While here fix a revision number in the 4.3 Changelog.

Obtained from:	gcc 4.3 (rev. 122831 - partial; GPLv2)
MFC after:	3 weeks
Put in the correct bit shifting and add a type to prevent clang from complaining.
While here fix up a grammar nit.

Pointed out by: Sergey Kandaurov and bz@ respectively.
Add a note that this file is compiled as part of the kernel and libc.

Requested by:	kib
MFC after:	3 days
Change cap_rights_merge(3) and cap_rights_remove(3) to return pointer
to the destination cap_rights_t structure.

This already matches manual page.

MFC after:	3 days
Sync return value with actual implementation.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
Style.

MFC after:	3 days
Precisely document capability rights here too (they are already documented
in rights(4)).

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
The CAP_LINKAT, CAP_MKDIRAT, CAP_MKFIFOAT, CAP_MKNODAT, CAP_RENAMEAT,
CAP_SYMLINKAT and CAP_UNLINKAT capability rights make no sense without
the CAP_LOOKUP right, so include this rights.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days
- Move CAP_EXTATTR_* and CAP_ACL_* rights to index 1 to have more room
  in index 0 for the future.
- Move CAP_BINDAT and CAP_CONNECTAT rights to index 0 so we can include
  CAP_LOOKUP right in them.
- Shuffle the bits around so there are no gaps. This is last chance to do
  that as all moved rights are not used yet.

Sponsored by:	The FreeBSD Foundation
MFC after:	3 days