[mlir] NFC - Appease gcc 5

This should fix the error ```
VectorToSCF.cpp:238:62: error: specialization of 'template<class
ConcreteOp> mlir::LogicalResult
{anonymous}::NDTransferOpHelper<ConcreteOp>::doReplace()' in different
namespace
```

mlir/lib/Conversion/VectorToSCF/VectorToSCF.cpp

@@ -133,7 +133,6 @@ private:
   VectorType minorVectorType; // vector<(minor_dims) x type>
   MemRefType memRefMinorVectorType; // memref<vector<(minor_dims) x type>>
 };
-} // namespace
 
 template <typename ConcreteOp>
 template <typename Lambda>
@@ -273,6 +272,8 @@ LogicalResult NDTransferOpHelper<TransferWriteOp>::doReplace() {
   return success();
 }
 
+} // namespace
+  
 /// Analyzes the `transfer` to find an access dimension along the fastest remote
 /// MemRef dimension. If such a dimension with coalescing properties is found,
 /// `pivs` and `vectorBoundsCapture` are swapped so that the invocation of