[mlir][Transforms] Preserve all analysis in print passes (#101315)

PrintIRPass, PrintOpStatsPass and PrintOpGraphPass don't mutate IR so
preserve all analysis to save computation resource a bit.

Author: uenoku

mlir/lib/Transforms/OpStats.cpp

@@ -55,6 +55,7 @@ void PrintOpStatsPass::runOnOperation() {
     printSummaryInJSON();
   } else
     printSummary();
+  markAllAnalysesPreserved();
 }
 
 void PrintOpStatsPass::printSummary() {

mlir/lib/Transforms/PrintIR.cpp

@@ -25,6 +25,7 @@ struct PrintIRPass : public impl::PrintIRPassBase<PrintIRPass> {
       llvm::dbgs() << " " << this->label;
     llvm::dbgs() << " //----- //\n";
     getOperation()->dump();
+    markAllAnalysesPreserved();
   }
 };
 

mlir/lib/Transforms/ViewOpGraph.cpp

@@ -93,6 +93,7 @@ class PrintOpPass : public impl::ViewOpGraphBase<PrintOpPass> {
       processOperation(getOperation());
       emitAllEdgeStmts();
     });
+    markAllAnalysesPreserved();
   }
 
   /// Create a CFG graph for a region. Used in `Region::viewGraph`.