sw64: trace user task unalignment

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I73O8X



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It specifies user command to be traced, and records count, address
and PC into debugfs. Note that it can only trace a task with its
command name.

To specify command name and clear old unaligned stat:
	echo something > /sys/kernel/debug/sw64/unaligned

To show unaligned stat:
	cat /sys/kernel/debug/sw64/unaligned

Signed-off-by: Gao Chen <gaochen@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>