sw64: bpf: fix ebpf jit compiler

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5PNGJ



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

This patch makes following changes to ebpf jit compiler:
   * switch to unsigned 64-bit div and mod to avoid incorrect overflow
     result
   * fix calling other bpf programs directly
   * fix tail call
   * fix jit_fill_hole()
   * change ILLEGAL_INSN so it can be used in the future

Results of "test_verifier" in jited and emulated mode are now same.

Extra space in jited image is now filled with illegal instructions
correctly.

Signed-off-by: Mao Minkai <maominkai@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>