[Clang][RISCV] Recognize unsupport target feature by supporting isValidFeatureName (#106495) This patch makes unsupported target attributes emit a warning and ignore the target attribute during semantic checks. The changes include: 1. Adding the RISCVTargetInfo::isValidFeatureName function. 2. Rejecting non-full-arch strings in the handleFullArchString function. 3. Adding test cases to demonstrate the warning behavior.
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