Debugger: step into default property getter/setter

#KT-7287 Fixed

idea/testData/debugger/tinyApp/src/stepInto/stepInto/defaultAccessors.kt

@@ -0,0 +1,28 @@
+package defaultAccessors
+
+fun main(args: Array<String>) {
+    //Breakpoint!
+    A().testPublicPropertyInClass()
+    testPublicPropertyInLibrary()
+}
+
+class A: B() {
+    fun testPublicPropertyInClass() {
+        prop
+        prop = 2
+    }
+}
+
+open class B {
+    public var prop: Int = 1
+}
+
+fun testPublicPropertyInLibrary() {
+    val myClass = customLib.simpleLibFile.B()
+    myClass.prop
+    myClass.prop = 2
+}
+
+// STEP_INTO: 21
+// SKIP_SYNTHETIC_METHODS: true
+// SKIP_CONSTRUCTORS: true