llvm-project

8c0f84e7 - [flang] Add RegionBranchOpInterface to fir.do_loop (#202418)

[flang] Add RegionBranchOpInterface to fir.do_loop (#202418) `fir.do_loop` lacked RegionBranchOpInterface, causing dataflow analyses and others to treat host loops as opaque and conservatively block optimizations. Implement getSuccessorRegions, getEntrySuccessorOperands, and getSuccessorInputs on fir.do_loop, and override getMutableSuccessorOperands on fir.result to customize for accommodating the occasionally present finalValue in `fir.result`. As a side effect, alias analysis now resolves pass-through iter-carried references to MustAlias instead of MayAlias.