[fir] Add !fir.ptr type conversion

[rovka]

Summary

This patch is part of the upstreaming effort for fir-dev.

Co-authored-by: Jean Perier <[e-mail]>

[clementval]

LGTM

flang/test/Fir/types-to-llvm.fir

39

Nit: separate the two tests with a blank line.

flang/lib/Optimizer/CodeGen/TypeConverter.h

LLVMTypeConverter(mlir::ModuleOp module)
 
     // Each conversion should return a value of type mlir::Type.
     addConversion([&](BoxType box) { return convertBoxType(box); });
     addConversion([&](fir::LogicalType boolTy) {
       return mlir::IntegerType::get(
           &getContext(), kindMapping.getLogicalBitsize(boolTy.getFKind()));
     });
     addConversion(
+        [&](fir::PointerType pointer) { return convertPointerLike(pointer); });
+    addConversion(
         [&](fir::RecordType derived) { return convertRecordType(derived); });
     addConversion(
         [&](fir::ComplexType cmplx) { return convertComplexType(cmplx); });
     addConversion(
         [&](fir::RealType real) { return convertRealType(real.getFKind()); });
     addConversion(
         [&](fir::ReferenceType ref) { return convertPointerLike(ref); });
     addConversion(

flang/test/Fir/types-to-llvm.fir

 // CHECK-LABEL: foo0
 // CHECK-SAME: !llvm.ptr<i32>
 func private @foo1(%arg0: !fir.ref<!fir.array<10xf32>>)
 // CHECK-LABEL: foo1
 // CHECK-SAME: !llvm.ptr<array<10 x f32>>
 
 // -----
 
+// Test pointer types `!fir.ptr`
+
+func private @foo0(%arg0: !fir.ptr<i32>)
+// CHECK-LABEL: foo0
+// CHECK-SAME: !llvm.ptr<i32>
+func private @foo1(%arg0: !fir.ptr<!fir.array<10xf32>>)
+// CHECK-LABEL: foo1
+// CHECK-SAME: !llvm.ptr<array<10 x f32>>
+
+// -----
+
 // Test box types `!fir.box`
 
 func private @foo0(%arg0: !fir.box<!fir.array<?xf32>>)
 // CHECK-LABEL: foo0
 // CHECK-SAME: !llvm.ptr<struct<(ptr<f32>, i{{.*}}, i{{.*}}, i{{.*}}, i{{.*}}, i{{.*}}, i{{.*}}, array<1 x array<3 x i{{.*}}>>)>>
 
 func private @foo1(%arg0: !fir.box<!fir.array<10xf32>>)
 // CHECK-LABEL: foo1