fix(PTW): High bits of GVPN should not be truncated

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[XiangShanRobot]

[Generated by IPC robot]
commit: 30202ef

commit	astar	copy_and_run	coremark	gcc	gromacs	hmmer-Vector	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
30202ef	1.806	0.442	2.641	1.230	2.150	1.676	2.149	2.364	0.933	1.389	2.010	3.108	2.538	2.274	3.309

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	hmmer-Vector	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
d7ff192						1.676			0.933						3.309
8893eb2	1.806	0.442	2.641	1.236	2.150	1.676	2.149	2.364	0.933	1.389	2.010	3.108	2.538	2.274	3.309
961164a	1.806	0.442	2.641	1.227	2.150	1.676	2.149	2.364	0.933	1.378	2.010	3.108	2.538	2.274	3.309
42b75a5	1.806	0.442	2.641	1.229	2.150	1.676	2.149	2.364	0.933	1.378	2.010	3.108	2.538	2.274	3.309
f9395f7	1.806	0.442	2.641	1.229	2.150	1.676	2.149	2.364	0.933	1.389	2.010	3.108	2.538	2.274	3.309
c1eb288	1.806	0.442	2.641	1.237	2.150	1.676	2.149	2.364	0.933	1.389	2.010	3.108	2.538	2.274	3.309
9d7a35d	1.822	0.442	2.641	1.228	2.158	1.676	2.144	2.364	0.940	1.378	1.972	3.112	2.538	2.272	3.300
fad7c42	1.823	0.442	2.641	1.228	2.158	1.676	2.144	2.364	0.940	1.389	1.972	3.112	2.538	2.272	3.300
dfb03ba	1.822	0.442	2.641	1.234	2.158	1.676	2.144	2.364	0.940	1.378	1.972	3.112	2.538	2.272	3.300
d6b0a27	1.823	0.442	2.641	1.226	2.158	1.676	2.144	2.364	0.940	1.378	1.972	3.112	2.538	2.272	3.300