CoupledL2, Uncache, LSQ: support non-data error handling

[linjuanZ]

According to CHI specification, a non-data error should be reported when an error is detected that is not related to data corruption. Typically this error is reported for:

• An attempt to access a location that does not exist.
• An illegal access, such as a write to a read only location.
• An attempt to use a transaction type that is not supported.

While the second kind of errors can be resolved by PMA, the first and the third kind of errors were not supported yet.

This commit implements non-data error handling path. MMIOBridge in CoupledL2 transfers CHI RespErr field downwards into TileLink denied field upwards. Uncache in DCache passes the error to LSQ to generate access fault exception:

• For MMIO loads, UncacheBuffer writes back exceptionVec to LoadUnit s0 and informs exception address to ExceptionBuffer at the same time.
• For MMIO stores, SQ writes back exceptionVec to Backend directly.

BTW, data error is still not supported.

[XiangShanRobot]

[Generated by IPC robot] commit: 2e2f0458448c24c824328787c77e7da5bbd2ff66	commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
2e2f045	1.822	0.448	2.060	1.180	2.944	2.503	2.291	0.932	1.419	1.328	3.437	2.644	2.399	2.931

master branch:	commit	astar	copy_and_run	coremark	gcc	gromacs	lbm	linux	mcf	microbench	milc	namd	povray	wrf	xalancbmk
202ef6b	1.815	0.448	2.060	1.182	2.953	2.504	2.291	0.930	1.403	1.319	3.426	2.660	2.397	2.940
4c46d75	1.815	0.448	2.060	1.182	2.953	2.504	2.291	0.930	1.403	1.319	3.426	2.660	2.397	2.940
807e518	1.815	0.448	2.060	1.182	2.953	2.504	2.291	0.930	1.403	1.319	3.426	2.660	2.397	2.940
5820cff	1.815	0.448	2.060	1.182	2.953	2.504	2.291	0.930	1.403	1.319	3.426	2.660	2.397	2.940
8daac0b
c41a9f7
31fae68	1.815	0.448	2.060	1.182	2.953	2.504	2.291	0.930	1.403	1.319	3.426	2.660	2.397	2.940
071c63e	1.815	0.448	2.060	1.182	2.953	2.504	2.291	0.930	1.403	1.319	3.426	2.660	2.397	2.940
6b742a1	1.821	0.448	2.054	1.173	2.950	2.500	2.291	0.923	1.376	1.265	3.448	2.667	2.398	2.940
dc30dd9	1.821	0.448	2.054	1.173	2.950	2.500	2.291	0.923	1.376	1.265	3.448	2.667	2.398	2.940