add warnings if noinit is ignored

compiler/cgen.nim

@@ -1067,6 +1067,8 @@ proc genProcAux(m: BModule, prc: PSym) =
       if sfNoInit in prc.flags and p.config.selectedGC notin {gcArc, gcOrc}: discard
       elif allPathsAsgnResult(procBody) == InitSkippable: discard
       else:
+        if sfNoInit in prc.flags and p.config.selectedGC in {gcArc, gcOrc}:
+          message(m.config, resNode.info, warnNoInitIgnored, "")
         resetLoc(p, res.loc)
       if skipTypes(res.typ, abstractInst).kind == tyArray:
         #incl(res.loc.flags, lfIndirect)

compiler/lineinfos.nim

@@ -78,6 +78,7 @@ type
     warnAnyEnumConv = "AnyEnumConv",
     warnHoleEnumConv = "HoleEnumConv",
     warnCstringConv = "CStringConv",
+    warnNoInitIgnored = "NoInitIgnored"
     warnEffect = "Effect",
     warnUser = "User",
     # hints
@@ -170,6 +171,7 @@ const
     warnAnyEnumConv: "$1",
     warnHoleEnumConv: "$1",
     warnCstringConv: "$1",
+    warnNoInitIgnored: "noInit is ignored",
     warnEffect: "$1",
     warnUser: "$1",
     hintSuccess: "operation successful: $#",