[BOLT] Refactor instruction creation interface. NFCI #85292
Merged
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Refactor MCPlusBuilder's create{Instruction}() functions that used to return bool. We almost never check the return value as we rely on llvm_unreachable() to detect unimplemented functionality. There were a couple of cases that checked the return value, but they would hit the unreachable condition first (at least in debug builds) before the return value gets checked.