replace greedy pattern rewrites with partial conversions

better failure messages

src/PIM/Pass/PimCodegen/MaterializeHostConstantsPass.cpp

@@ -160,6 +160,7 @@ struct MaterializeHostConstantsPass : PassWrapper<MaterializeHostConstantsPass,
     }
 
     if (hasFailure) {
+      moduleOp.emitError("PIM host-constant materialization failed; see diagnostics above");
       signalPassFailure();
       return;
     }