Support property delegation to inline class values (KT-27070)

compiler/testData/codegen/bytecodeText/inlineClasses/noBoxingUnboxingInAccessorsForDelegatedPropertyWithInlineClassDelegate.kt

@@ -0,0 +1,33 @@
+// !LANGUAGE: +InlineClasses
+// FILE: Foo.kt
+class Foo {
+    var a: Int = 42
+    var d by DelegateFactory(0)
+}
+
+// FILE: delegates.kt
+inline class DelegateFactory(val default: Int) {
+    operator fun provideDelegate(thisRef: Any?, prop: Any?) = Delegate(default)
+}
+
+inline class Delegate(val default: Int) {
+
+    operator fun getValue(thisRef: Any?, prop: Any?) =
+        (thisRef as? Foo)?.a ?: default
+
+    operator fun setValue(thisRef: Any?, prop: Any?, newValue: Int) {
+        if (thisRef is Foo) {
+            thisRef.a = newValue
+        }
+    }
+}
+
+
+// @Foo.class:
+// 0 DelegateFactory\.box
+// 0 DelegateFactory\.unbox
+// 0 Delegate\.box
+// 0 Delegate\.unbox
+// 1 INVOKESTATIC DelegateFactory\.provideDelegate-impl \(ILjava/lang/Object;Ljava/lang/Object;\)I
+// 1 INVOKESTATIC Delegate\.getValue-impl \(ILjava/lang/Object;Ljava/lang/Object;\)I
+// 1 INVOKESTATIC Delegate\.setValue-impl \(ILjava/lang/Object;Ljava/lang/Object;I\)V