Use getfield or putfield instructions for private properties instead of invokevirtual getA or setA

compiler/testData/codegen/properties/accessToPrivateProperty.kt

@@ -0,0 +1,52 @@
+class A {
+    private var foo = 1
+        get() {
+            return 1
+        }
+
+    fun foo() {
+        foo = 5
+        foo
+    }
+}
+
+class B {
+    private val foo = 1
+        get
+
+    fun foo() {
+        foo
+    }
+}
+
+class C {
+    private var foo = 1
+        get
+        set
+
+    fun foo() {
+        foo = 2
+        foo
+    }
+}
+
+class D {
+    private var foo = 1
+        set(i: Int) {
+            foo = i + 1
+        }
+
+    fun foo() {
+        foo = 5
+        foo
+    }
+}
+
+fun box(): String {
+    A().foo()
+    B().foo()
+    C().foo()
+    D().foo()
+    return "OK"
+}
+

compiler/testData/codegen/properties/accessToPrivateSetter.kt

@@ -0,0 +1,13 @@
+class D {
+    var foo = 1
+        private set
+
+    fun foo() {
+        foo = 2
+    }
+}
+
+fun box(): String {
+   D().foo()
+   return "OK"
+}