Add more tests from the latest snapshot

backend.native/tests/external/codegen/boxInline/optimizations/kt20844.kt

@@ -0,0 +1,27 @@
+// FILE: 1.kt
+//WITH_RUNTIME
+package test
+
+data class Address(
+        val createdTimeMs: Long = 0,
+        val firstName: String = "",
+        val lastName: String = ""
+)
+
+inline fun String.switchIfEmpty(provider: () -> String): String {
+    return if (isEmpty()) provider() else this
+}
+
+// FILE: 2.kt
+
+import test.*
+
+fun box(): String {
+    val address = Address()
+    val result = address.copy(
+            firstName = address.firstName.switchIfEmpty { "O" },
+            lastName = address.lastName.switchIfEmpty { "K" }
+    )
+
+    return result.firstName + result.lastName
+}