ARC: remove unnecessary code

lib/system/refs_v2.nim

@@ -57,8 +57,6 @@ template head(p: pointer): Cell =
 const
   traceCollector = defined(traceArc)
 
-var allocs*: int
-
 proc nimNewObj(size: int): pointer {.compilerRtl.} =
   let s = size + sizeof(RefHeader)
   when defined(nimscript):
@@ -71,10 +69,6 @@ proc nimNewObj(size: int): pointer {.compilerRtl.} =
     result = allocShared0(s) +! sizeof(RefHeader)
   else:
     result = alloc0(s) +! sizeof(RefHeader)
-  when hasThreadSupport:
-    atomicInc allocs
-  else:
-    inc allocs
   when traceCollector:
     cprintf("[Allocated] %p\n", result -! sizeof(RefHeader))
 
@@ -100,14 +94,6 @@ proc nimRawDispose(p: pointer) {.compilerRtl.} =
       deallocShared(p -! sizeof(RefHeader))
     else:
       dealloc(p -! sizeof(RefHeader))
-    if allocs > 0:
-      when hasThreadSupport:
-        discard atomicDec(allocs)
-      else:
-        dec allocs
-    else:
-      cstderr.rawWrite "[FATAL] unpaired dealloc\n"
-      quit 1
 
 template dispose*[T](x: owned(ref T)) = nimRawDispose(cast[pointer](x))
 #proc dispose*(x: pointer) = nimRawDispose(x)

tests/destructor/towned_binary_tree.nim

@@ -1,7 +1,7 @@
 discard """
-  cmd: '''nim c --newruntime $file'''
+  cmd: '''nim c -d:nimAllocStats --newruntime $file'''
   output: '''331665
-allocs 0'''
+(allocCount: 333335, deallocCount: 333335)'''
 """
 
 #  bug #11053
@@ -87,6 +87,5 @@ proc main() =
       discard
   echo res
 
-when isMainModule:
+dumpAllocStats:
   main()
-  echo "allocs ", allocs