gc:destructors progress

lib/system/mmdisp.nim

@@ -505,10 +505,12 @@ else:
   elif defined(gcRegions):
     # XXX due to bootstrapping reasons, we cannot use  compileOption("gc", "stack") here
     include "system/gc_regions"
-  elif defined(nimV2):
+  elif defined(nimV2) or defined(gcDestructors):
     var allocator {.rtlThreadVar.}: MemRegion
     instantiateForRegion(allocator)
-  elif defined(gcMarkAndSweep) or defined(gcDestructors):
+    when defined(gcDestructors):
+      include "system/gc_hooks"
+  elif defined(gcMarkAndSweep):
     # XXX use 'compileOption' here
     include "system/gc_ms"
   else: