vtype: fix x-propagation and vtype walk value when using snapshot

[Ziyue-Zhang]

No description provided.

[XiangShanRobot]

[Generated by IPC robot]
commit: 33767ef

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
33767ef	1.859	0.448	2.096	1.179	2.491	2.595	2.332	0.956	1.377	1.405	3.124	2.650	2.442	2.957

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
2b16f0c								0.957						2.957
9c1b710			2.096	1.187				0.956	1.377					2.957
c8cff56	1.867	0.448	2.096	1.180	2.492	2.595	2.335	0.962	1.377	1.367	3.124	2.650	2.442	2.957
90ae5a7	1.865	0.449	2.096	1.188	2.483	2.581	2.333	0.954	1.377	1.421	3.118	2.666	2.439	2.955
60311af	1.862	0.449	2.096	1.176	2.481	2.581	2.333	0.956	1.377	1.394	3.118	2.666	2.439	2.955
3adc700	1.858	0.449	2.106	1.182	2.483	2.586	2.328	0.950	1.387	1.282	3.127	2.639	2.432	2.946
c2bbba9	1.852	0.449	2.106	1.188	2.483	2.586	2.328	0.949	1.387	1.412	3.127	2.639	2.432	2.946
175dc3e	1.862	0.449	2.103	1.188	2.483	2.597	2.329	0.952	1.389	1.360	3.123	2.636	2.431	2.953
9f2c7f7	1.857	0.449	2.091	1.188	2.476	2.588	2.331	0.956	1.392	1.365	3.124	2.630	2.432	2.954
2316cea	1.855	0.450	2.103	1.177	2.478	2.594	2.328	0.957	1.398	1.421	3.117	2.655	2.454	2.952

[XiangShanRobot]

[Generated by IPC robot]
commit: af4f5ef

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
af4f5ef	1.874	0.448	2.096	1.185	2.493	2.594	2.329	0.957	1.377	1.411	3.124	2.650	2.442	2.957

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
1fb367e	1.861		2.096	1.190	2.490	2.598		0.954	1.377	1.356	3.124		2.442	2.943
2b16f0c	1.856	0.448	2.096	1.183	2.487	2.594	2.333	0.957	1.377	1.408	3.124	2.650	2.442	2.957
9c1b710	1.863	0.448	2.096	1.187	2.493	2.595	2.337	0.956	1.377	1.355	3.124	2.650	2.442	2.957
c8cff56	1.867	0.448	2.096	1.180	2.492	2.595	2.335	0.962	1.377	1.367	3.124	2.650	2.442	2.957
90ae5a7	1.865	0.449	2.096	1.188	2.483	2.581	2.333	0.954	1.377	1.421	3.118	2.666	2.439	2.955
60311af	1.862	0.449	2.096	1.176	2.481	2.581	2.333	0.956	1.377	1.394	3.118	2.666	2.439	2.955
3adc700	1.858	0.449	2.106	1.182	2.483	2.586	2.328	0.950	1.387	1.282	3.127	2.639	2.432	2.946
c2bbba9	1.852	0.449	2.106	1.188	2.483	2.586	2.328	0.949	1.387	1.412	3.127	2.639	2.432	2.946
175dc3e	1.853	0.449	2.103	1.188	2.482	2.597	2.329	0.952	1.389	1.365	3.123	2.636	2.431	2.953
9f2c7f7	1.857	0.449	2.091	1.188	2.476	2.588	2.331	0.956	1.392	1.365	3.124	2.630	2.432	2.954

[XiangShanRobot]

[Generated by IPC robot]
commit: 05038a7

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
05038a7	1.861	0.448	2.096	1.190	2.490	2.598	2.335	0.954	1.377	1.356	3.124	2.651	2.442	2.943

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
94e6af6	1.861	0.448	2.096	1.190	2.490	2.598	2.335	0.954	1.377	1.356	3.124	2.651	2.442	2.943
1fb367e	1.861	0.448	2.096	1.190	2.490	2.598	2.335	0.954	1.377	1.356	3.124	2.651	2.442	2.943
2b16f0c	1.856	0.448	2.096	1.183	2.487	2.594	2.333	0.957	1.377	1.408	3.124	2.650	2.442	2.957
9c1b710	1.863	0.448	2.096	1.187	2.493	2.595	2.337	0.956	1.377	1.355	3.124	2.650	2.442	2.957
c8cff56	1.867	0.448	2.096	1.180	2.492	2.595	2.335	0.962	1.377	1.367	3.124	2.650	2.442	2.957
90ae5a7	1.865	0.449	2.096	1.188	2.483	2.581	2.333	0.954	1.377	1.421	3.118	2.666	2.439	2.955
60311af	1.862	0.449	2.096	1.176	2.481	2.581	2.333	0.956	1.377	1.394	3.118	2.666	2.439	2.955
3adc700	1.858	0.449	2.106	1.182	2.483	2.586	2.328	0.950	1.387	1.282	3.127	2.639	2.432	2.946
c2bbba9	1.852	0.449	2.106	1.188	2.483	2.586	2.328	0.949	1.387	1.412	3.127	2.639	2.432	2.946
175dc3e	1.853	0.449	2.103	1.188	2.482	2.597	2.329	0.952	1.389	1.365	3.123	2.636	2.431	2.953