[JITLink] Use SubtargetFeatures to store features in LinkGraph D149522 introduced target features to LinkGraph. However, to avoid a public dependency on MC, the features were stored in a std::vector instead of using SubtargetFeatures directly. Since SubtargetFeatures was moved from MC to TargetParser (D150549), we can now use it directly to store the features. This patch implements that and removes the (private) dependency on MC. Reviewed By: lhames Differential Revision: https://reviews.llvm.org/D153749
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