fix(LSU): fix misalign store exception logic

[Anzooooo]

No description provided.

[XiangShanRobot]

[Generated by IPC robot]
commit: 02e8b1f

commit	astar	copy_and_run	coremark	gcc	gromacs	hmmer-Vector	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
02e8b1f	1.819	0.442	2.636	1.228	2.143	1.500	2.145	2.360	0.943	1.408	1.998	3.113	2.567	2.271	3.303

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	hmmer-Vector	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
30c0e6f		0.442	2.636					2.360		1.401			2.567
4378b55	1.819	0.442	2.636	1.236	2.143	1.500	2.145	2.360	0.943	1.408	1.998	3.113	2.567	2.271	3.303
bb42dd8	1.819	0.442	2.636	1.230	2.143	1.500	2.145	2.360	0.943	1.405	1.998	3.113	2.567	2.271	3.303
4c06265	1.819	0.442	2.636	1.232	2.143	1.500	2.145	2.360	0.943	1.405	1.998	3.113	2.567	2.271	3.303
92330f9	1.819	0.442	2.636	1.231	2.143	1.500	2.145	2.360	0.943	1.408	1.998	3.113	2.565	2.271	3.303
1fe7f8b	1.819	0.442	2.636	1.230	2.143	1.500	2.145	2.360	0.943	1.405	1.998	3.113	2.565	2.271	3.303
deb92d6	1.819	0.442	2.636	1.235	2.143	1.500	2.145	2.360	0.943	1.401	1.998	3.113	2.565	2.271	3.303
5137113	1.819	0.442	2.636	1.225	2.143	1.500	2.145	2.360	0.943	1.405	1.998	3.113	2.565	2.271	3.303
6f9d483	1.819	0.442	2.636	1.221	2.143	1.500	2.145	2.360	0.942	1.405	1.998	3.113	2.565	2.271	3.303