[clang] [Clang][RISCV] Recognize unsupport target feature by supporting isValidFeatureName (PR #106495)

[Piyou Chen via cfe-commits]

BeMg wrote:

Rebase with https://github.com/llvm/llvm-project/pull/106680 and drop the 
`__RISCV_TargetAttrNeedOverride` relate code section.

https://github.com/llvm/llvm-project/pull/106495
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