[DebugInfo][JumpThreading] Missing debug location updates for branch instructions

[Apochens]

JumpThreading-L1041

The debug location of BBTerm does not be propagated to the new branch instruction, though the new branch instruction replaces BBTerm.

    BranchInst::Create(BBTerm->getSuccessor(BestSucc), BBTerm->getIterator());
    ++NumFolds;
    BBTerm->eraseFromParent();

JumpThreading-L1660

The debug location of Term does not be propagated to the new branch instruction, though the new branch instruction replaces Term.

      Instruction *Term = BB->getTerminator();
      BranchInst::Create(OnlyDest, Term->getIterator());
      ++NumFolds;
      Term->eraseFromParent();

[llvmbot]

@llvm/issue-subscribers-debuginfo

Author: Shan Huang (Apochens)

[**JumpThreading-L1041**](https://github.com/llvm/llvm-project/blob/8467cc61cef88818b5ac811176aa6fd7b22c7538/llvm/lib/Transforms/Scalar/JumpThreading.cpp#L1041)

The debug location of BBTerm does not be propagated to the new branch instruction, though the new branch instruction replaces BBTerm.

    BranchInst::Create(BBTerm->getSuccessor(BestSucc), BBTerm->getIterator());
    ++NumFolds;
    BBTerm->eraseFromParent();

JumpThreading-L1660

The debug location of Term does not be propagated to the new branch instruction, though the new branch instruction replaces Term.

      Instruction *Term = BB->getTerminator();
      BranchInst::Create(OnlyDest, Term->getIterator());
      ++NumFolds;
      Term->eraseFromParent();