[llvm] [mlir] [MLIR] Add debug log to the pass manager (NFC) (PR #156205)

[Jacques Pienaar via llvm-commits]

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@@ -744,25 +844,50 @@ void OpToOpPassAdaptor::runOnOperation(bool verifyPasses) {
 
 /// Run this pass adaptor synchronously.
 void OpToOpPassAdaptor::runOnOperationImpl(bool verifyPasses) {
+  LDBG() << "Running pass adaptor synchronously on operation '"
+         << OpWithFlags(getOperation(), OpPrintingFlags().skipRegions())
+         << "' with " << mgrs.size()
+         << " pass managers, verifyPasses=" << verifyPasses;
+  LLVM_DEBUG(LDBG_OS(os, 1); printAsTextualPipeline(os, /*pretty=*/false);
+             os << "\n");
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jpienaar wrote:

Is newline needed? 

https://github.com/llvm/llvm-project/pull/156205