Bump nemu ref in ready-to-run (#123)

NEMU commit: dc71f5819270fd887c14177b3f812b3ff24831b8
NEMU configs:
- riscv64-xs-ref_defconfig
- riscv64-dual-xs-ref_defconfig
- riscv64-xs-ref-debug_defconfig
- riscv64-dual-xs-ref-debug_defconfig
- riscv64-xs-ref_bitmap_defconfig

Including: * fix(MMU): read PTE !in_pmem should report accessFault (#900) * fix(PMA): accessFault should be reported when none PMA entry matches (#901) * fix(build): allow to use clang++ to compile * fix(clang): add attr for unused static functions * fix(utils): add “C” mark to resolve C/C++ linkage conflict * fix(intr): move definitions out of EHelper headers to avoid nested functions * fix(csr): add reserved pad to dummy CSR structs * ci(clang): add Clang defconfig and improve compilation test script * fix(paddr): do PMP & PMA check before multi-core goldenmem read (#905) * fix(vleff): fix mask agnostic of vleff (#906)

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