Add tests for obsolete issues

#KT-12126
 #KT-12189
 #KT-23628
 #KT-24209
 #KT-34338
 #KT-47279
 #KT-48498

compiler/testData/codegen/boxInline/delegatedProperty/kt48498.kt

@@ -0,0 +1,18 @@
+// FILE: 1.kt
+
+package x
+
+operator fun String.provideDelegate(thisRef: Any?, prop: Any?) = this
+
+operator fun String.getValue(thisRef: Any?, prop: Any?) = this
+
+inline fun foo(): String {
+    val x by "OK"
+    return x
+}
+
+// FILE: 2.kt
+
+import x.*
+
+fun box(): String = foo()

compiler/testData/codegen/boxInline/innerClasses/kt12126.kt

@@ -0,0 +1,25 @@
+// IGNORE_BACKEND: JVM
+// IGNORE_BACKEND_MULTI_MODULE: JVM, JVM_MULTI_MODULE_IR_AGAINST_OLD
+// FILE: a.kt
+
+package test
+
+open class A {
+    val v = "OK"
+
+    open inner class AA {
+        protected inline fun inAA(crossinline modifier: (String) -> String): String = modifier(v)
+    }
+}
+
+// FILE: b.kt
+
+import test.*
+
+class B : A() {
+    inner class BB : AA() {
+        fun test(): String = inAA { i -> i }
+    }
+}
+
+fun box(): String = B().BB().test()