make fillObjectFields recur over base type (#24854)

fixes #24847

Object constructors call `fillObjectFields` when a field inside the
constructor does not have a location, however when the field is from a
base type this does not process it. Now `fillObjectFields` also calls
itself for the base type to fix this but not sure if this is a good
solution as `fillObjectFields` is used in other places too.

(cherry picked from commit a625fab098)

compiler/ccgtypes.nim

@@ -768,6 +768,8 @@ proc fillObjectFields*(m: BModule; typ: PType) =
   # this fact here.
   var check = initIntSet()
   discard getRecordFields(m, typ, check)
+  if typ.baseClass != nil:
+    fillObjectFields(m, typ.baseClass.skipTypes(skipPtrs))
 
 proc mangleDynLibProc(sym: PSym): Rope