Deserialize annotations on class object properties

Class object properties' backing fields are generated into static fields of the
containing class, not into fields of class object. For fields we now store the
flag which, if set, tells that this field should be looked for in the
containing class

compiler/frontend.java/serialization.java/src/java_descriptors.proto

@@ -51,6 +51,10 @@ message JavaMethodSignature {
 message JavaFieldSignature {
   required int32 name = 1;
   required JavaType type = 2;
+
+  // True iff this field is a backing field for a class object and is really present as a static
+  // field in the outer class, not as an instance field here
+  optional bool is_static_in_outer = 3 [default = false];
 }
 
 message JavaPropertySignature {