bpu: improve the CGE of bpu/predictors_update_*

[Lawrence-ID]

Try to improve Clock Gate Efficiency of the bpu/predictors_update_*

Not synthesized yet.

Include predictors.io.update.bits.meta, predictors.io.update.bits.full_target, predictors.io.update.bits.pc, predictors.io.update.bits.ftb_entry, predictors.io.update.bits.cfi_idx.

And here are some that haven't been improved yet: predictors.io.update.bits.ghist

[XiangShanRobot]

[Generated by IPC robot]
commit: 075b3ae

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
075b3ae	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
94d703a	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
47986d3	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
38f78b5	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
e6ac7fe	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
ec15951	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
dab1ad8	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
c6655c9	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
340ef6e	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956
571677c	1.784	0.458	2.003	1.199	2.920	2.498	2.207	0.928	1.374	1.441	3.153	2.600	2.385	2.956

[eastonman]

succesor #3265