[tests] string builder appendln tests

backend.native/tests/build.gradle

@@ -1380,6 +1380,12 @@ task string_builder0(type: RunKonanTest) {
     source = "runtime/text/string_builder0.kt"
 }
 
+task string_builder1(type: RunKonanTest) {
+    expectedFail = (project.testTarget == 'wasm32') // Uses exceptions.
+    goldValue = "HelloKotlin\n42\n0.1\ntrue\n\n"
+    source = "runtime/text/string_builder1.kt"
+}
+
 task string0(type: RunKonanTest) {
     goldValue = "true\ntrue\nПРИВЕТ\nпривет\nПока\ntrue\n"
     source = "runtime/text/string0.kt"

backend.native/tests/runtime/text/string_builder1.kt

@@ -0,0 +1,5 @@
+fun main(arg:Array<String>) {
+    val a = StringBuilder()
+    a.append("Hello").appendln("Kotlin").appendln(42).appendln(0.1).appendln(true)
+    println(a.toString())	
+}