[BOLT][NFC] Add MCSubtargetInfo to MCPlusBuilder #68223
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On RISC-V, it's helpful to have access to `MCSubtargetInfo` while generating instructions in `MCPlusBuilder`. For example, a return instruction might be generated differently based on if the target supports compressed instructions (`c.jr ra`) or not (`jalr ra`).
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On RISC-V, it's helpful to have access to
MCSubtargetInfowhile generating instructions inMCPlusBuilder. For example, a return instruction might be generated differently based on if the target supports compressed instructions (c.jr ra) or not (jalr ra).