new_contents: from binding import *
  from src.namespace import llvm
  from src.Value import MDNode
  from src.Instruction import Instruction, TerminatorInst
  llvm.includes.add('llvm/Transforms/Utils/BasicBlockUtils.h')
  
  SplitBlockAndInsertIfThen = llvm.Function('SplitBlockAndInsertIfThen',
                                            ptr(TerminatorInst),
                                            ptr(Instruction), # cmp
                                            cast(bool, Bool), # unreachable
                                            ptr(MDNode)) # branchweights
  
  ReplaceInstWithInst = llvm.Function('ReplaceInstWithInst',
                                      Void,
                                      ptr(Instruction), # from
                                      ptr(Instruction)) # to
subject: Add some utils in BasicBlockUtils.h