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Add RISC-V support for XRay. The RV64 implementation has been tested in both QEMU and in our hardware environment. Currently this requires D and C extensions, but since both RV64GC and RVA22/RVA23 are becoming mainstream, I don't think this requirement will be a big problem. Based on the previous work by @a-poduval : https://reviews.llvm.org/D117929 --------- Co-authored-by: Ashwin Poduval <ashwin.poduval@gmail.com>