Overhaul logging.

src/xenia/cpu/backend/x64/x64_sequences.cc

@@ -3163,7 +3163,7 @@ bool SelectSequence(X64Emitter* e, const Instr* i, const Instr** new_tail) {
       return true;
     }
   }
-  XELOGE("No sequence match for variant %s", i->opcode->name);
+  XELOGE("No sequence match for variant {}", i->opcode->name);
   return false;
 }