
Fix `MapLattice` API to return `std::pair<iterator, bool>`, allowing users to detect when an element has been inserted without performing a redundant map lookup. Differential Revision: https://reviews.llvm.org/D130497
Fix `MapLattice` API to return `std::pair<iterator, bool>`, allowing users to detect when an element has been inserted without performing a redundant map lookup. Differential Revision: https://reviews.llvm.org/D130497