bpf, x86: save/restore regs with BPF_DW size

[ Upstream commit 02a6dfa8

 ]

As we already reserve 8 byte in the stack for each reg, it is ok to
store/restore the regs in BPF_DW size. This will make the code in
save_regs()/restore_regs() simpler.

Signed-off-by: Menglong Dong <imagedong@tencent.com>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/r/20230713040738.1789742-2-imagedong@tencent.com


Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Stable-dep-of: 2b5dcb31

 ("bpf, x64: Fix tailcall infinite loop")
Signed-off-by: Sasha Levin <sashal@kernel.org>