Bpu: Optimize CGE of bpu/predictors_io_update

[Lawrence-ID]

Bpu: Optimize CGE of bpu/predictors_io_update by moving update regs into predictors, except for the update PC

[XiangShanRobot]

[Generated by IPC robot]
commit: 0320241

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
0320241	1.865	0.450	2.695	1.186	2.832	2.488	2.400	0.919	1.397	1.454	3.415	2.747	2.423	3.212

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
0c658d9		0.450	2.695	1.186			2.400	0.919	1.397			2.747		3.212
0345934		0.450	2.695	1.186			2.400	0.919	1.397	1.454	3.415	2.747		3.212
63d67ef	1.865		2.695	1.186	2.832	2.488		0.919	1.397	1.454	3.415		2.423	3.212
e9f7c49	1.865	0.450	2.695	1.186	2.832	2.488	2.400	0.919	1.397	1.454	3.415	2.747	2.423	3.212
7acf8b7	1.855	0.450	2.695	1.186	2.832	2.488	2.400	0.919	1.397	1.454	3.415	2.747	2.423	3.212
78a6e80	1.855	0.450	2.695	1.186	2.832	2.488	2.400	0.919	1.397	1.454	3.415	2.747	2.423	3.212
ecdd929	1.855	0.450	2.695	1.186	2.822	2.490	2.400	0.919	1.397	1.454	3.362	2.756	2.418	3.212
cdb8dc6	1.865	0.450	2.695	1.186	2.822	2.490	2.400	0.919	1.397	1.454	3.362	2.756	2.418	3.212

[Lingrui98]

pc field of update bundle and other update data are not in the same stage, would be better if add some comments to mark that information