[RISCV][Clang][TargetParser] Support getting feature unaligned-scalar-mem from mcpu. (#71513)
This patch reference ac1ffd3c to suppot a soft coding way to identify whether a cpu has a feature `unaligned-scalar-mem` by `RISCVProcessors.td`. This patch does not provide test case since there is no risc-v cpu support `unaligned-scalar-mem` in llvm upstream now.
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