x86_64: bpf: implement jitting of JMP32

mainline inclusion
from mainline-v5.1-rc1
commit 3f5d6525
category: bugfix
bugzilla: NA
CVE: CVE-2021-3444

--------------------------------

This patch implements code-gen for new JMP32 instructions on x86_64.

Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: Jiong Wang <jiong.wang@netronome.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: He <Fengqing&lt;hefengqing@huawei.com>
Reviewed-by: Kuohai Xu <xukuohai@huawei.com>
Reviewed-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>