[mlir][openacc][NFC] add anonymous namespace around LegalizeDataOpForLLVMTranslation class

[clementval]

Summary

Add missing anonymous namespace around LegalizeDataOpForLLVMTranslation class .

mlir/lib/Conversion/OpenACCToLLVM/OpenACCToLLVM.cpp

 void DataDescriptor::setSize(OpBuilder &builder, Location loc, Value size) {
   setPtr(builder, loc, kSizePosInDataDescriptor, size);
 }
 
 //===----------------------------------------------------------------------===//
 // Conversion patterns
 //===----------------------------------------------------------------------===//
 
+namespace {
+
 template <typename Op>
 class LegalizeDataOpForLLVMTranslation : public ConvertOpToLLVMPattern<Op> {
   using ConvertOpToLLVMPattern<Op>::ConvertOpToLLVMPattern;
 
   LogicalResult
   matchAndRewrite(Op op, ArrayRef<Value> operands,
                   ConversionPatternRewriter &builder) const override {
     Location loc = op.getLoc();
matchAndRewrite(Op op, ArrayRef<Value> operands,
     }
 
     builder.replaceOpWithNewOp<Op>(op, TypeRange(), convertedOperands,
                                    op.getOperation()->getAttrs());
 
     return success();
   }
 };
+} // namespace
 
 void mlir::populateOpenACCToLLVMConversionPatterns(
     LLVMTypeConverter &converter, OwningRewritePatternList &patterns) {
   patterns.add<LegalizeDataOpForLLVMTranslation<acc::EnterDataOp>>(converter);
   patterns.add<LegalizeDataOpForLLVMTranslation<acc::ExitDataOp>>(converter);
   patterns.add<LegalizeDataOpForLLVMTranslation<acc::UpdateOp>>(converter);
 }