[Tests] Add test for KT-57391

^KT-57391

compiler/testData/codegen/box/multiplatform/kt57391.kt

@@ -0,0 +1,28 @@
+// LANGUAGE: +MultiPlatformProjects
+// ISSUE: KT-57391
+// WITH_STDLIB
+
+// KT-57391: CONFLICTING_OVERLOADS
+// IGNORE_BACKEND_K1: JS_IR, JS_IR_ES6, WASM
+// KT-57391: java.lang.IllegalStateException: IrSimpleFunctionPublicSymbolImpl for /main|main(){}[0] is already bound
+// IGNORE_BACKEND_K2: JS_IR, JS_IR_ES6, WASM
+
+// KT-57391: Backend Internal error: Exception during psi2ir
+// in K1/NATIVE/ONE_STAGE_MULTI_MODULE, native testsystem ignores fun `main` in `common` module, hence `common` module is not compiled at all.
+// IGNORE_NATIVE_K1: mode=TWO_STAGE_MULTI_MODULE
+// KT-57391: error: platform declaration clash: The following functions have the same IR signature
+// IGNORE_BACKEND_K2: NATIVE
+
+// MODULE: common
+// FILE: common.kt
+fun main() {
+    println("Hello, Foo")
+}
+
+// MODULE: platform()()(common)
+// FILE: platform.kt
+fun main() {
+    println("Hello, Kotlin/Native!")
+}
+
+fun box() = "OK"