remove name field for ARC (#20797)

* remove name field for ARC

* mistake

* improvement

* better

* typo

* fixes a pre-existing bug

lib/system.nim

@@ -1595,7 +1595,8 @@ when not defined(js) and defined(nimV2):
       align: int16
       depth: int16
       display: ptr UncheckedArray[uint32] # classToken
-      name: cstring
+      when defined(nimTypeNames):
+        name: cstring
       traceImpl: pointer
       typeInfoV1: pointer # for backwards compat, usually nil
       flags: int

lib/system/cyclebreaker.nim

@@ -138,7 +138,8 @@ proc breakCycles(s: Cell; desc: PNimTypeV2) =
       else:
         # anyhow as a link that the produced destructor does not have to follow:
         u[] = nil
-        cprintf("[Bug] %p %s RC %ld\n", t, desc.name, t.rc shr rcShift)
+        when traceCollector:
+          cprintf("[Bug] %p %s RC %ld\n", t, desc.name, t.rc shr rcShift)
   deinit j.traceStack
 
 proc thinout*[T](x: ref T) {.inline.} =