[mlir][OpenMP] Use correct debug location with link clause. (#145026)

Please see the following program.

```
module test_0
    INTEGER :: sp = 1
!$omp declare target link(sp)
end module test_0

program main
use test_0
integer :: new_len

!$omp target map(tofrom:new_len) map(tofrom:sp)
    new_len = sp
!$omp end target

  print *, new_len
  print *, sp
end program
```

When compiled with
`flang -g -O0 -fopenmp --offload-arch=gfx1100`

will fail the compilation with the following error:

`dbg attachment points at wrong subprogram for function`

The reason is that with the `link` clause on `!$omp declare target`, an
extra load instruction is inserted. But the debug location was not
updated before insertion which caused an invalid location to be attached
to the instruction.
2 files changed
tree: b4da4486f14350fb818ec9c4ec286a94476b2f45
  1. .ci/
  2. .github/
  3. bolt/
  4. clang/
  5. clang-tools-extra/
  6. cmake/
  7. compiler-rt/
  8. cross-project-tests/
  9. flang/
  10. flang-rt/
  11. libc/
  12. libclc/
  13. libcxx/
  14. libcxxabi/
  15. libunwind/
  16. lld/
  17. lldb/
  18. llvm/
  19. llvm-libgcc/
  20. mlir/
  21. offload/
  22. openmp/
  23. polly/
  24. runtimes/
  25. third-party/
  26. utils/
  27. .clang-format
  28. .clang-format-ignore
  29. .clang-tidy
  30. .git-blame-ignore-revs
  31. .gitattributes
  32. .gitignore
  33. .mailmap
  34. CODE_OF_CONDUCT.md
  35. CONTRIBUTING.md
  36. LICENSE.TXT
  37. pyproject.toml
  38. README.md
  39. SECURITY.md
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