Fix deserialization of default property accessor flags

In MemberDeserializer.loadProperty, we incorrectly passed 0 to
getAnnotations when loading annotations on property accessors in case
the protobuf field getter_flags/setter_flags was not present. The
correct behavior, as described in metadata.proto, was to pass a special
"default accessor flags" value, constructed from the main property
flags. Otherwise in case there were annotations both on the property and
on the accessor (as in PropertyAndAccessor.kt) and the accessor was
otherwise default, we would assume that it had no annotations and would
not load them in compiler and reflection

 #KT-25499 In Progress

compiler/testData/codegen/box/annotations/annotationsOnNonExistentAccessors.kt

@@ -3,25 +3,6 @@
 
 // Please make sure that this test is consistent with the diagnostic test "annotationsTargetingNonExistentAccessor.kt"
 
-// FILE: Temporary.java
-
-// see https://youtrack.jetbrains.com/issue/KT-25499
-
-class Temporary {
-    public static void checkX2FromStaticsHasAnnotations() {
-        try {
-            if (Statics.Companion.getClass().getDeclaredMethod("getX2").getAnnotations().length == 0) {
-                throw new RuntimeException("there are no annotations");
-            }
-        }
-        catch (NoSuchMethodException e) {
-            throw new RuntimeException(e);
-        }
-    }
-}
-
-// FILE: test.kt
-
 import kotlin.reflect.KAnnotatedElement
 import kotlin.reflect.KProperty
 
@@ -152,9 +133,9 @@ class Statics {
         check(::x0.getter, annotationExists = false)
         check(::x1.getter, annotationExists = false)
 
-        check(::x2.getter, annotationExists = false) // https://youtrack.jetbrains.com/issue/KT-25499
-        check(::x2.setter, annotationExists = false)
-        check(::x2.setter.parameters.first(), annotationExists = false)
+        check(::x2.getter, annotationExists = true)
+        check(::x2.setter, annotationExists = true)
+        check(::x2.setter.parameters.first(), annotationExists = false /* TODO */)
 
         check(::x3.getter, annotationExists = false)
 
@@ -185,7 +166,6 @@ fun box(): String {
     PrivateProperties(0, "").test()
     EffetivelyPrivate.test()
     Statics().test()
-    Temporary.checkX2FromStaticsHasAnnotations()
     Delegate().test()
     return "OK"
 }