[MLIR] MLIREnzymeAnalysis fails to build: getSuccessorInputs removed in current MLIR

## `MLIREnzymeAnalysis` fails to build against current MLIR (`getSuccessorInputs` removed) `enzyme/Enzyme/MLIR/Analysis/ActivityAnalysis.cpp` calls `RegionBranchOpInterface::getSuccessorInputs` and `RegionBranchTerminatorOpInterface` in a way that no longer compiles against MLIR main (and LLVM/MLIR 22). Both APIs were changed as part of the region branch interface refactor upstream. ### Error ``` ActivityAnalysis.cpp:1169:28: error: 'class mlir::RegionBranchOpInterface' has no member named 'getSuccessorInputs'; did you mean 'getSuccessorRegions'? ActivityAnalysis.cpp:1284:37: error: no match for call to '(...lambda...)(mlir::Operation*&, mlir::RegionBranchTerminatorOpInterface, std::deque<mlir::Block*>&)' note: no known conversion for argument 2 from 'mlir::RegionBranchTerminatorOpInterface' to 'mlir::RegionBranchPoint' ``` ### Impact `MLIREnzymeAnalysis` is a transitive dependency of `MLIREnzymeTransforms` and `enzymemlir-opt`, so the entire MLIR test suite (`test/MLIR/`) is currently broken on main. ### Relevant upstream change `getSuccessorInputs` was removed and `RegionBranchTerminatorOpInterface` was replaced by `RegionBranchPoint` in the MLIR region branch interface refactor. The fix likely involves updating the two call sites in `ActivityAnalysis.cpp` to use the new API.