Add one more test for mangling top-levels in ObjCExport

backend.native/tests/objcexport/expectedLazy.h

@@ -611,6 +611,8 @@ __attribute__((objc_subclassing_restricted))
 __attribute__((swift_name("TopLevelManglingAKt")))
 @interface KtTopLevelManglingAKt : KtBase
 + (NSString *)foo __attribute__((swift_name("foo()")));
++ (int32_t)sameNumberValue:(int32_t)value __attribute__((swift_name("sameNumber(value:)")));
++ (int64_t)sameNumberValue:(int64_t)value __attribute__((swift_name("sameNumber(value:)")));
 @property (class, readonly) NSString *bar __attribute__((swift_name("bar")));
 @end;
 

backend.native/tests/objcexport/topLevelMangling.swift

@@ -10,11 +10,17 @@ private func testPropertiesInDifferentFilesAreNotMangled() throws {
     try assertEquals(actual: TopLevelManglingBKt.bar, expected: "b2")
 }
 
+private func testFunctionsInSameFileAreMangled() throws {
+    try assertEquals(actual: TopLevelManglingAKt.sameNumber(value: Int32(1)), expected: 1)
+    try assertEquals(actual: TopLevelManglingAKt.sameNumber(value_: Int64(2)), expected: 2)
+}
+
 class TopLevelManglingTests : SimpleTestProvider {
     override init() {
         super.init()
 
         test("TestFunctionsInDifferentFilesAreNotMangled", testFunctionsInDifferentFilesAreNotMangled)
         test("TestPropertiesInDifferentFilesAreNotMangled", testPropertiesInDifferentFilesAreNotMangled)
+        test("TestFunctionsInSameFileAreMangled", testFunctionsInSameFileAreMangled)
     }
 }

backend.native/tests/objcexport/topLevelManglingA.kt

@@ -2,3 +2,6 @@ package topLevelManglingA
 
 fun foo() = "a1"
 val bar = "a2"
+
+fun sameNumber(value: Int) = value
+fun sameNumber(value: Long) = value