timing(LoadUnit): fpWen and pdest reg out

[cz4e]

when loadunit writeback

• fpWen uses register directly out
• pdest uses register directly out

[XiangShanRobot]

[Generated by IPC robot]
commit: 11b555a

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
11b555a	1.814	0.442	2.640	1.230	2.152	2.141	2.361	0.933	1.407	1.985	3.107	2.558	2.267	3.308

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
23767fc	1.814	0.442	2.640	1.231	2.152	2.141	2.361	0.933	1.403	1.985	3.107	2.558	2.267	3.308
14651e9	1.814	0.442	2.639	1.231	2.152	2.142	2.361	0.933	1.406	1.985	3.107	2.558	2.267	3.308
77733a7	1.814	0.442	2.640	1.231	2.152	2.141	2.361	0.933	1.403	1.985	3.107	2.558	2.267	3.308
da51a7a	1.814	0.442	2.639	1.231	2.152	2.141	2.361	0.933	1.407	1.985	3.107	2.558	2.267	3.308
c75efc0	1.814	0.442	2.639	1.231	2.152	2.141	2.361	0.933	1.403	1.985	3.107	2.558	2.267	3.308