add memory coalescing pass

better reports
refactor for more code-reuse and patter usage
fixes

src/PIM/Conversion/ONNXToSpatial/ONNXToSpatialPass.cpp

@@ -94,7 +94,7 @@ void ONNXToSpatialPass::runOnOperation() {
   RewritePatternSet prePatterns(ctx);
   populatePrePatterns(prePatterns, ctx);
   if (failed(applyPatternsGreedily(moduleOp, std::move(prePatterns))))
-    llvm::dbgs() << "Failed to apply pre-patterns, continuing...\n";
+    moduleOp.emitWarning("failed to apply ONNX-to-Spatial pre-patterns; continuing");
 
   auto entryFunc = getPimEntryFunc(moduleOp);
   if (failed(entryFunc)) {
@@ -148,7 +148,8 @@ void ONNXToSpatialPass::runOnOperation() {
         computeOpsCount++;
 
     if (computeOpsCount > coresCount) {
-      llvm::dbgs() << "Number of compute ops exceeds the core count\n";
+      entryFunc->emitError() << "number of compute ops (" << computeOpsCount << ") exceeds the core count ("
+                             << coresCount << ")";
       signalPassFailure();
       return;
     }
@@ -157,7 +158,7 @@ void ONNXToSpatialPass::runOnOperation() {
   PassManager cleanupPM(ctx);
   cleanupPM.addPass(createCanonicalizerPass());
   if (failed(cleanupPM.run(moduleOp)))
-    llvm::dbgs() << "Failed to run canonicalization cleanup, continuing...\n";
+    moduleOp.emitWarning("failed to run ONNX-to-Spatial canonicalization cleanup; continuing");
 
   annotateWeightsConstants(*entryFunc);