[clang] [llvm] [RISCV] Add processor definition for SpacemiT-X60 (PR #94564)

[Shao-Ce SUN via cfe-commits]

sunshaoce wrote:

I've tested this patch with `spec 2006 int`. Everything seems to be running smoothly:
```
                                  Estimated                       Estimated
                Base     Base       Base        Peak     Peak       Peak
Benchmarks      Ref.   Run Time     Ratio       Ref.   Run Time     Ratio
-------------- ------  ---------  ---------    ------  ---------  ---------
400.perlbench    9770       1899       5.14 *
401.bzip2        9650       3284       2.94 *
403.gcc          8050       1990       4.05 *
429.mcf          9120       5440       1.68 *
445.gobmk       10490       1805       5.81 *
456.hmmer        9330       2585       3.61 *
458.sjeng       12100       2180       5.55 *
462.libquantum  20720        990      20.9  *
464.h264ref     22130       3376       6.56 *
471.omnetpp      6250       3084       2.03 *
473.astar        7020       2613       2.69 *
483.xalancbmk    6900       1873       3.68 *
```
@preames Could we merge this patch?

https://github.com/llvm/llvm-project/pull/94564