[flang] Fix compilation problem with rename of "MemRefDataFlow"

[PeteSteinfeld]

Summary

Revision https://reviews.llvm.org/D104190 renamed MemRefDataFlow -> AffineScalarReplacement. After this rename, mlir failed to build. With this change, all of clang, mlir, and flang build and test correctly.

[bondhugula]

Thanks for fixing this - sorry I had missed updating flang.

flang/include/flang/Optimizer/Support/InitFIR.h

inline void registerMLIRPassesForFortranTools() {
   mlir::registerCSEPass();
   mlir::registerAffineLoopFusionPass();
   mlir::registerLoopInvariantCodeMotionPass();
   mlir::registerLoopCoalescingPass();
   mlir::registerStripDebugInfoPass();
   mlir::registerPrintOpStatsPass();
   mlir::registerInlinerPass();
   mlir::registerSCCPPass();
-  mlir::registerMemRefDataFlowOptPass();
+  mlir::registerAffineScalarReplacementPass();
   mlir::registerSymbolDCEPass();
   mlir::registerLocationSnapshotPass();
   mlir::registerAffinePipelineDataTransferPass();
 
   mlir::registerAffineVectorizePass();
   mlir::registerAffineLoopUnrollPass();
   mlir::registerAffineLoopUnrollAndJamPass();
   mlir::registerSimplifyAffineStructuresPass();