[mlir] Add a newline character in the Linalg debug macro

[awarzynski]

Not sure whether the omission of \n was deliberate? I do struggle to parse the debug logs without it :( Thanks for taking a look!

[ftynse]

At the time this was added, we were printing a newline after ops and such by default.

[dcaballe]

I think we may have two new lines printed now in some cases. I was adding some explicit "\n" in one of my masking patches.

mlir/lib/Dialect/Linalg/Transforms/Vectorization.cpp

 #include <type_traits>
 
 using namespace mlir;
 using namespace mlir::linalg;
 
 #define DEBUG_TYPE "linalg-vectorization"
 
 #define DBGS() (llvm::dbgs() << '[' << DEBUG_TYPE << "] ")
-#define LDBG(X) LLVM_DEBUG(DBGS() << X)
+#define LDBG(X) LLVM_DEBUG(DBGS() << X << "\n")
 
 /// Try to vectorize `convOp` as a convolution.
 static FailureOr<Operation *> vectorizeConvolution(RewriterBase &rewriter,
                                                    LinalgOp convOp);
 
 /// Return the unique instance of OpType in `block` if it is indeed unique.
 /// Return null if none or more than 1 instances exist.
 template <typename OpType>