Fix #14325 (#17308)

* Fix #14325
* Refactor and fix

tests/ccgbugs/tlvalueconv.nim

@@ -1,3 +1,9 @@
+discard """
+  matrix: "--gc:refc; --gc:arc"
+"""
+
+# bug #14160
+
 type
   TPassContext = object of RootObj
   PPassContext = ref TPassContext
@@ -11,5 +17,16 @@ type
 proc main() =
   var g = ModuleGraph(vm: new(Pctx))
   PCtx(g.vm) = nil #This generates invalid C code
+  doAssert g.vm == nil
 
 main()
+
+# bug #14325
+
+proc main2() =
+  var g = ModuleGraph(vm: new(Pctx))
+  PPassContext(PCtx(g.vm)) = nil #This compiles, but crashes at runtime with gc:arc
+  doAssert g.vm == nil
+
+main2()
+