[RISC-V][MC] Reject x0 as the address/temporary register for load/store pseudos (#227512) Using the zero register as the destination for integer load pseudos or as the temporary register for floating-point load and store pseudos is illegal since it is used to synthesize the target address, and using x0 would mean the auipc/qc.e.li result is ignored and we access an invalid location. This commit was created with the help of AI tools Pull-Request: https://github.com/llvm/llvm-project/pull/227512
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