[clang] [RISCV] Add -march=unset to cancel and ignore a previous -march. (PR #148321)

[Fangrui Song via cfe-commits]

https://github.com/MaskRay approved this pull request.

Thanks! The reactions include a thumbs-up and a love. Setting my approval.

https://github.com/llvm/llvm-project/pull/148321
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