Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

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

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

Adjust a test case and make it more jump optimization neutral for JIT case.

Make this test case little bit more interesting.

Correct copyright date in the BPF regression test.

Adjust BPF JIT compiler regression tests to catch up with r199603.

Add a test case for very long BPF program.

Connect a forgotten test case to Makefile.

Do not pass validatation level since all issues are fixed now.

Merge local copy of bpf_validate() with bpf_filter.c.

Merge bpf_filter.c r182425 and add test cases for jump range checks.

While I am here, fix stupid typos in test0080.h and make it JIT compiler only.

Move comments to the right places.

Merge bpf_filter.c r182412 and remove additional local checks.

While I am here, use more realistic value for illegal code test case.

Fix style consistencies and a comment.

Merge bpf_filter.c r182380 and remove additional local checks
for BPF_STX and BPF_LDX|BPF_MEM instructions.

Add a test case for uninitialized scratch memory (for JIT compiler).

Add a test case for null filter.

Add more test cases for invalid instructions and add comments
about bpf_validate(9) issues.

Remove some hacks from regression test since bpf_filter.c builds fine now.

Add a trivial bpf filter benchmark.

Use sys/net/bpf_jitter.c instead of rolling our own version
since it is compilable on user land now.

Reflect sys/net/bpf_jitter.h changes to regression test.

Add test case for 'divide by 0' with BPF_ALU|BPF_DIV|BPF_X instruction.

Fix two test cases on 32-bit architectures.

Add simple bpf(9) regression tests and test cases.