remove extra header

Author: grypp

mlir/lib/Conversion/NVGPUToNVVM/NVGPUToNVVM.cpp

@@ -20,7 +20,6 @@
 #include "mlir/Dialect/SCF/Transforms/Patterns.h"
 #include "mlir/IR/BuiltinTypes.h"
 #include "mlir/IR/ImplicitLocOpBuilder.h"
-#include "mlir/IR/Location.h"
 #include "mlir/IR/PatternMatch.h"
 #include "mlir/IR/TypeUtilities.h"
 #include "mlir/IR/Value.h"