[flang][openacc] Lower default clause to acc.data operation attributes

[clementval]

Summary

Lowering of the default clause was missing on the acc.data operation. This
patch lowers the default clause to its corresponding attribute.

[razvanlupusoru]

Looks great! Thank you for adding missed default clause handling.

[clementval]

Rebase

[clementval]

Rebase

flang/lib/Lower/OpenACC.cpp

if (const auto *asyncClause =
       genPrivatizations<mlir::acc::FirstprivateRecipeOp>(
           firstprivateClause->v, converter, semanticsContext, stmtCtx,
           firstprivateOperands, firstPrivatizations);
     } else if (const auto *reductionClause =
                    std::get_if<Fortran::parser::AccClause::Reduction>(
                        &clause.u)) {
       genReductions(reductionClause->v, converter, semanticsContext, stmtCtx,
                     reductionOperands, reductionRecipes);
-    } else if (const auto *defaultClause =
-                   std::get_if<Fortran::parser::AccClause::Default>(
-                       &clause.u)) {
+    } else if(const auto *defaultClause = 
+                  std::get_if<Fortran::parser::AccClause::Default>(&clause.u)) {
       if ((defaultClause->v).v == llvm::acc::DefaultValue::ACC_Default_none)
         hasDefaultNone = true;
-      else if ((defaultClause->v).v ==
-               llvm::acc::DefaultValue::ACC_Default_present)
+      else if ((defaultClause->v).v == llvm::acc::DefaultValue::ACC_Default_present)
         hasDefaultPresent = true;
     }
   }
 
   // Prepare the operand segment size attribute and the operands value range.
   llvm::SmallVector<mlir::Value, 8> operands;
   llvm::SmallVector<int32_t, 8> operandSegments;
   addOperand(operands, operandSegments, async);