KT-5214 Annotation to provide platform name to avoid signature conflict

#KT-5214 Fixed

compiler/testData/codegen/boxWithStdlib/platformNames/functionName.kt

@@ -0,0 +1,11 @@
+import kotlin.platform.*
+
+[platformName("bar")]
+fun foo() = "foo"
+
+fun box(): String {
+    val f = foo()
+    if (f != "foo") return "Fail: $f"
+
+    return "OK"
+}