use low level interop for fi export

Author: elringus

samples/bench/dotnet-llvm/Program.cs

@@ -29,8 +29,9 @@ public static string EchoStruct ()
         return JsonSerializer.Serialize(data, SourceGenerationContext.Default.Data);
     }
 
-    [JSExport]
-    public static int Fi (int n) => n <= 1 ? n : Fi(n - 1) + Fi(n - 2);
+    [UnmanagedCallersOnly(EntryPoint = "fi")]
+    public static int FiExport (int n) => Fi(n);
+    private static int Fi (int n) => n <= 1 ? n : Fi(n - 1) + Fi(n - 2);
 
     [DllImport("x", EntryPoint = "getNumber")]
     private static extern int GetNumber ();

samples/bench/dotnet-llvm/init.mjs

@@ -16,6 +16,6 @@ export async function init() {
     return {
         echoNumber: runtime.Module._echoNumber,
         echoStruct: exports.Program.EchoStruct,
-        fi: exports.Program.Fi
+        fi: runtime.Module._fi
     };
 }