Backend: fix Uncertain Layency Fu's clock gate

[sinceforYy]

No description provided.

[XiangShanRobot]

[Generated by IPC robot]
commit: 2b18c16

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
2b18c16	1.809	0.452	2.052	1.196	2.951	2.499	2.199	0.930	1.377	1.407	3.436	2.653	2.398	2.941

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
c08d352			2.052				2.197	0.930	1.377			2.653		2.941
87c5d21	1.805	0.452	2.052	1.196	2.951	2.499	2.199	0.930	1.377	1.407	3.436	2.653	2.398	2.941
864480f	1.809	0.452	2.052	1.196	2.951	2.499	2.199	0.930	1.377	1.407	3.436	2.653	2.398	2.941
69a3c27	1.805	0.452	2.052	1.196	2.951	2.499	2.197	0.930	1.377	1.407	3.436	2.653	2.398	2.941
a31db3f	1.805	0.452	2.052	1.196	2.951	2.499	2.197	0.930	1.377	1.407	3.436	2.653	2.398	2.941
5adc482	1.801	0.452	2.039	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
0d257fb	1.801	0.452	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
ba5ba1d	1.805	0.452	2.039	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
6613a2d	1.801	0.448	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
9810c04	1.805	0.448	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932