llvm-project

21fdc728 - [NFC][Clang][OpenMP] Change MEH member of `AttachPtrExprComparator` from pointer to reference. (#161785)

[NFC][Clang][OpenMP] Change MEH member of `AttachPtrExprComparator` from pointer to reference. (#161785) Also adds an instance of `AttachPtrExprComparator` to the `MappableExprHandler` class, so that it can be reused for multiple comparisons. This was extracted out of #153683 to make that PR more focused on the functional changes.