Revert "ARC Analysis in one pass (#16849)" (#16984)

This reverts commit ab740cb5b9.

tests/arc/tmovebug.nim

@@ -93,6 +93,7 @@ destroy
 destroy
 destroy
 sink
+sink
 destroy
 copy
 (f: 1)
@@ -686,7 +687,7 @@ caseNotAConstant()
 
 proc potentialSelfAssign(i: var int) =
   var a: array[2, OO]
-  a[i] = OO(f: 1) # turned into a memcopy
+  a[i] = OO(f: 1)
   a[1] = OO(f: 2)
   a[i+1] = a[i] # This must not =sink, but =copy
   inc i
@@ -743,30 +744,3 @@ proc partToWholeUnownedRef =
 
 partToWholeUnownedRef()
 
-
-#--------------------------------------------------------------------
-# test that nodes that get copied during the transformation
-# (like dot exprs) don't loose their firstWrite/lastRead property
-
-type
-  OOO = object
-    initialized: bool
-
-  C = object
-    o: OOO
-
-proc `=destroy`(o: var OOO) =
-  doAssert o.initialized, "OOO was destroyed before initialization!"
-
-proc initO(): OOO =
-  OOO(initialized: true)
-
-proc initC(): C =
-  C(o: initO())
-
-proc pair(): tuple[a: C, b: C] =
-  result.a = initC() # <- when firstWrite tries to find this node to start its analysis it fails, because injectdestructors uses copyTree/shallowCopy
-  result.b = initC()
-
-discard pair()
-