ftb:Higher register function merging. (higher regs clock gating efficiency)

[sleep-zzz]

No description provided.

[XiangShanRobot]

[Generated by IPC robot]
commit: b32fa16

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
b32fa16	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.960	1.377	1.427	3.123	2.639	2.451	2.960

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
363530d
a72b131
05d833a	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.961	1.377	1.427	3.123	2.639	2.451	2.960
9cb05b4		0.450	2.103				2.330		1.377			2.639
4daa5bf		0.450	2.103	1.190	2.468	2.593	2.329	0.962	1.377	1.427	3.123	2.639		2.960
1e018fb	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.962	1.377	1.427	3.123	2.639	2.451	2.960
3c71816	1.854	0.450	2.103	1.190	2.468	2.593	2.330	0.962	1.377	1.427	3.123	2.639	2.451	2.960
dfe034b	1.854	0.449	2.103	1.182	2.170	2.181	2.328	0.972	1.386	1.294	2.742	2.592	2.283	2.951
bdc1606	1.854	0.449	2.101	1.182	2.170	2.181	2.329	0.973	1.386	1.294	2.742	2.589	2.283	2.951
dc5a918	1.854	0.449	2.103	1.181	2.170	2.181	2.329	0.973	1.386	1.294	2.742	2.589	2.283	2.951

[XiangShanRobot]

[Generated by IPC robot]
commit: f771752

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
f771752	1.875	0.448	2.096	1.177	2.487	2.594	2.336	0.954	1.377	1.417	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
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	1.184	2.483	2.597	2.329	0.953	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
e778bb8	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
c83747b	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

[eastonman]

LGTM as long as CI performance seems reasonable.

[XiangShanRobot]

[Generated by IPC robot]
commit: ab1c0dc

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
ab1c0dc	1.803	0.452	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932

master branch:

commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
5adc482	1.801	0.452	2.039	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
0d257fb	1.801	0.452	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
ba5ba1d	1.805	0.452	2.039	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
6613a2d	1.801	0.448	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
9810c04	1.805	0.448	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
0184a80	1.803	0.448	2.039	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
8fe4f15	1.805	0.448	2.039	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
54cc3a0	1.805	0.448	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
26c1abd	1.803	0.448	2.039	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932
fd3aa05	1.803	0.448	2.040	1.187	2.936	2.508	2.197	0.930	1.378	1.441	3.428	2.669	2.399	2.932