[Swift Export] KT-65008: support simple top-level properties

Merge-request: KT-MR-14131
Merged-by: Gleb Lukianets <Gleb.Lukianets@jetbrains.com>

native/swift/swift-export-standalone/testData/variables/golden_result/result.h

@@ -0,0 +1,12 @@
+#include <stdint.h>
+
+int32_t namespace_main_foo_get();
+
+int32_t namespace_main_bar_get();
+
+void namespace_main_bar_set(int32_t newValue);
+
+int32_t namespace_main_foobar(int32_t param);
+
+int32_t __root___baz();
+

native/swift/swift-export-standalone/testData/variables/golden_result/result.kt

@@ -0,0 +1,32 @@
+import kotlin.native.internal.ExportedBridge
+
+@ExportedBridge("namespace_main_foo_get")
+public fun namespace_main_foo_get(): Int {
+    val result = namespace.main.foo()
+    return result
+}
+
+@ExportedBridge("namespace_main_bar_get")
+public fun namespace_main_bar_get(): Int {
+    val result = namespace.main.bar()
+    return result
+}
+
+@ExportedBridge("namespace_main_bar_set")
+public fun namespace_main_bar_set(newValue: Int): Unit {
+    val result = namespace.main.bar(newValue)
+    return result
+}
+
+@ExportedBridge("namespace_main_foobar")
+public fun namespace_main_foobar(param: Int): Int {
+    val result = namespace.main.foobar(param)
+    return result
+}
+
+@ExportedBridge("__root___baz")
+public fun __root___baz(): Int {
+    val result = baz()
+    return result
+}
+

native/swift/swift-export-standalone/testData/variables/golden_result/result.swift

@@ -0,0 +1,26 @@
+enum namespace {
+    enum main {
+        public static var foo: Swift.Int32 {
+            get {
+                return namespace_main_foo_get()
+            }
+        }
+        public static var bar: Swift.Int32 {
+            get {
+                return namespace_main_bar_get()
+            }
+            set {
+                namespace_main_bar_set(newValue)
+            }
+        }
+        public static func foobar(
+            param: Swift.Int32
+        ) -> Swift.Int32 {
+            return namespace_main_foobar(param)
+        }
+    }
+}
+
+public func baz() -> Swift.Int32 {
+    return __root___baz()
+}

native/swift/swift-export-standalone/testData/variables/input_root/main.kt

@@ -0,0 +1,9 @@
+package namespace.main
+
+import namespace.*
+
+val foo: Int get() = 10
+
+var bar: Int = 20
+
+fun foobar(param: Int): Int = foo + bar + param + baz

native/swift/swift-export-standalone/testData/variables/input_root/no_package.kt

@@ -0,0 +1 @@
+fun baz: Int = 30