Merge branch 'line_info-check-for-ld_imm64'

Martin KaFai Lau says:

====================
This series ensures the line_info (passed by the userspace during
bpf_prog_load) cannot have its line_info.insn_off pointing to a
zero bpf insn code.  F.e. a broken userspace tool might
generate a line_info.insn_off that points to the second
8 bytes of a BPF_LD_IMM64.

The first patch is the kernel change.
The second patch is a new test case.
====================

Acked-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>