Piyou Chen 4b60e1e821 [RISCV] Add function that check extension name with version
Check whether a extension string with version is valid, and get the targetfeature from it.

New functions be used in RISCVISAInfo for https://reviews.llvm.org/D151730.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D152423
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