Add and (un)mute inline class tests

compiler/testData/codegen/box/inlineClasses/fieldNameClash.kt

@@ -0,0 +1,14 @@
+// IGNORE_BACKEND: JVM, JVM_IR, JS, JS_IR, NATIVE
+// There is a bug in the type mapper which results in an incorrect asm type for Z
+// when the names of the inline class backing field and an extension property clash.
+// https://youtrack.jetbrains.com/issue/KT-31927
+
+inline class Z(val s: String) {
+    val Int.s: Int get() = 42
+}
+
+fun box(): String {
+    if (Z("a").toString() == "Z(s=\"a\")")
+        return "OK"
+    return "Fail"
+}