Directly set BBID when parsing MIR.

Author: rlavaee

llvm/lib/CodeGen/MIRParser/MIParser.cpp

@@ -780,7 +780,7 @@ bool MIParser::parseBasicBlockDefinition(
                             "' is not defined in the function '" +
                             MF.getName() + "'");
   }
-  auto *MBB = MF.CreateMachineBasicBlock(BB);
+  auto *MBB = MF.CreateMachineBasicBlock(BB, BBID);
   MF.insert(MF.end(), MBB);
   bool WasInserted = MBBSlots.insert(std::make_pair(ID, MBB)).second;
   if (!WasInserted)
@@ -799,9 +799,6 @@ bool MIParser::parseBasicBlockDefinition(
     MBB->setSectionID(*SectionID);
     MF.setBBSectionsType(BasicBlockSection::List);
   }
-  if (BBID.has_value()) {
-    MBB->setBBID(BBID.value());
-  }
   MBB->setCallFrameSize(CallFrameSize);
   return false;
 }