[llvm-exegesis] Begin replacing unsigned with MCRegister. NFC (#123109) Some of this was needed to fix implicit conversions from MCRegister to unsigned when calling getReg() on MCOperand for example. The majority was done by reviewing parts of the code that dealt with registers, converting them to MCRegister and then seeing what new implicit conversions were created and fixing those. There were a few places where I used MCPhysReg instead of MCRegiser for static arrays since its uint16_t instead of unsigned.
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