Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Cross-merge bpf fixes after downstream PR.

Trivial conflict:
tools/testing/selftests/bpf/prog_tests/verifier.c

Adjacent changes in:
Auto-merging kernel/bpf/verifier.c
Auto-merging samples/bpf/Makefile
Auto-merging tools/testing/selftests/bpf/.gitignore
Auto-merging tools/testing/selftests/bpf/Makefile
Auto-merging tools/testing/selftests/bpf/prog_tests/verifier.c

Signed-off-by: Alexei Starovoitov <ast@kernel.org>