sw64: perf: fix support for dwarf in perf

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56X48



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This patch:
  - Fix the corresponding labels in kernel and perf according to the
    integer register sorting in libunwind.
  - Fix wrong stl and format styles in regs_load.S test program.

Now, we can pass perf test: dwarf.

Signed-off-by: He Chuyue <hechuyue@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>