[fir] Add !fir.ptr type conversion

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

Differential Revision: https://reviews.llvm.org/D113559

Co-authored-by: Jean Perier <jperier@nvidia.com>

flang/lib/Optimizer/CodeGen/TypeConverter.h

@@ -41,6 +41,8 @@ public:
       return mlir::IntegerType::get(
           &getContext(), kindMapping.getLogicalBitsize(boolTy.getFKind()));
     });
+    addConversion(
+        [&](fir::PointerType pointer) { return convertPointerLike(pointer); });
     addConversion(
         [&](fir::RecordType derived) { return convertRecordType(derived); });
     addConversion(

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

@@ -31,6 +31,18 @@ func private @foo1(%arg0: !fir.ref<!fir.array<10xf32>>)
 
 // -----
 
+// 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>>)