Fix isAccessible for property accessors

compiler/testData/codegen/boxWithStdlib/reflection/properties/privatePropertyCallIsAccessibleOnAccessors.kt

@@ -0,0 +1,41 @@
+import kotlin.reflect.*
+import kotlin.reflect.jvm.*
+import kotlin.test.*
+
+class A(private var foo: String)
+
+fun box(): String {
+    val a = A("")
+    val foo = A::class.memberProperties.single() as KMutableProperty1<A, String>
+
+    assertTrue(!foo.isAccessible)
+    assertTrue(!foo.getter.isAccessible)
+    assertTrue(!foo.setter.isAccessible)
+
+    val setter = foo.setter
+    setter.isAccessible = true
+    assertTrue(setter.isAccessible)
+    assertTrue(foo.setter.isAccessible)
+
+    // After we invoked isAccessible on a setter, the underlying field and thus the getter are also accessible
+    assertTrue(foo.isAccessible)
+    assertTrue(foo.getter.isAccessible)
+    setter.call(a, "A")
+    assertEquals("A", foo.getter.call(a))
+
+    setter.isAccessible = false
+    assertFalse(setter.isAccessible)
+    assertFalse(foo.setter.isAccessible)
+    assertFalse(foo.getter.isAccessible)
+    assertFalse(foo.isAccessible)
+
+    val getter = foo.getter
+    getter.isAccessible = true
+    assertTrue(setter.isAccessible)
+    assertTrue(foo.setter.isAccessible)
+    assertTrue(foo.isAccessible)
+    assertTrue(foo.getter.isAccessible)
+    assertTrue(getter.isAccessible)
+
+    return "OK"
+}

compiler/tests/org/jetbrains/kotlin/codegen/generated/BlackBoxWithStdlibCodegenTestGenerated.java

@@ -3537,6 +3537,12 @@ public class BlackBoxWithStdlibCodegenTestGenerated extends AbstractBlackBoxCode
                 doTestWithStdlib(fileName);
             }
 
+            @TestMetadata("privatePropertyCallIsAccessibleOnAccessors.kt")
+            public void testPrivatePropertyCallIsAccessibleOnAccessors() throws Exception {
+                String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/reflection/properties/privatePropertyCallIsAccessibleOnAccessors.kt");
+                doTestWithStdlib(fileName);
+            }
+
             @TestMetadata("privateToThisAccessors.kt")
             public void testPrivateToThisAccessors() throws Exception {
                 String fileName = JetTestUtils.navigationMetadata("compiler/testData/codegen/boxWithStdlib/reflection/properties/privateToThisAccessors.kt");

core/reflection.jvm/src/kotlin/reflect/jvm/callables.kt

@@ -42,6 +42,12 @@ public var KCallable<*>.isAccessible: Boolean
             is KProperty ->
                 javaField?.isAccessible ?: true &&
                 javaGetter?.isAccessible ?: true
+            is KProperty.Getter ->
+                property.javaField?.isAccessible ?: true &&
+                javaMethod?.isAccessible ?: true
+            is KMutableProperty.Setter<*> ->
+                property.javaField?.isAccessible ?: true &&
+                javaMethod?.isAccessible ?: true
             is KFunction ->
                 javaMethod?.isAccessible ?: true &&
                 this.javaConstructor?.isAccessible ?: true
@@ -59,6 +65,14 @@ public var KCallable<*>.isAccessible: Boolean
                 javaField?.isAccessible = value
                 javaGetter?.isAccessible = value
             }
+            is KProperty.Getter -> {
+                property.javaField?.isAccessible = value
+                javaMethod?.isAccessible = value
+            }
+            is KMutableProperty.Setter<*> -> {
+                property.javaField?.isAccessible = value
+                javaMethod?.isAccessible = value
+            }
             is KFunction -> {
                 javaMethod?.isAccessible = value
                 this.javaConstructor?.isAccessible = value