Revert "bpf: fix precision backtracking instruction iteration"

This reverts commit e37e3b6c which is
commit 4bb7ea94 upstream.

It breaks the Android kernel tests and can be brought back in the future
in an safe way if it is really needed.

Bug: 161946584
Change-Id: I951df34323f53b6e79c42ebf2cf79cc00e3c0c54
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>