Bump nemu ref in ready-to-run

NEMU commit: a2d7a7c70acd7ba4a2e58d261a0939dcbef88a00
NEMU configs:
- riscv64-xs-ref_defconfig
- riscv64-dual-xs-ref_defconfig
- riscv64-xs-ref-debug_defconfig
- riscv64-dual-xs-ref-debug_defconfig

Including: * feat(trigger, tdata3): sdtrig extension support tdata3 (#1036) * fix(Makefile): statically link libstdc++ for shared objects (#1044) * ci: bump the github-actions group with 6 updates (#1038) * chore: use dependabot to track actions updates (#1037) * feat(checkpoint): build checkpoint sources for SHARE (#1034) * feat(checkpoint): trim compressed pmem dumps by resident pages (#1031) * perf(ci): include ref regcpy in shared-object benchmark (#1029) * fix(checkpoint): read CLINT timer state directly (#1030) * fix(Zicclsm): fix cross page store PMP/PMA check (#1001) * perf(tcache): make simple tcache 4-way associative (#1024) * fix(ci): fetch perf baseline by exact commit (#1026) * fix(difftest): limit store_queue size to avoid OOM (#1022) * fix(monitor): start profiling on manual oneshot sigint (#1021)

XiangShan ready-to-run binaries

This repo includes some prebuilt workloads and difftest reference libaries. Please refer to XiangShan-doc to learn how to use them.

This repo may be abandoned in feature, as we are trying to provide prebuilt binaries through Github release.

Prebuilt difftest reference libaries

riscv64-nemu-interpreter-so
- NEMU difftest reference library
- Built via the ci of OpenXiangShan/NEMU.
riscv64-nemu-interpreter-dual-so
- NEMU difftest reference library with dual core difftest support.
riscv64-spike-so
- SPIKE difftest reference library
- Built via the ci of OpenXiangShan/riscv-isa-sim.

Prebuilt workloads

linux.bin
- Simple Linux boot-up test.
- OpenSBI v1.4 + Linux 6.1.83 + print Hello
- ~~Built accodring to XiangShan-doc~~
  - The document has not updated for OpenSBI yet.
microbench.bin
- Baremental test-scale microbench workload
- Built via the ci of OpenXiangShan/nexus-am, application is apps/microbench
coremark-2-iteration.bin
- Baremental 2-iteration Coremark workload
- Built via the ci of OpenXiangShan/nexus-am, application is apps/coremark
copy_and_run.bin
- Copy 1-iteration coremark from flash to memory, and run it.
- Built via the ci of OpenXiangShan/nexus-am, application is apps/loader
flash_recursion_test.bin