don't track result initialization if it is marked noinit (#24499)

We don't track `noinit` for variables introduced in
https://github.com/nim-lang/Nim/pull/10566. It should be applied to
`result` if the function is marked `noinit`

lib/pure/volatile.nim

@@ -19,7 +19,6 @@ proc volatileLoad*[T](src: ptr T): T {.inline, noinit.} =
     when defined(js):
       result = src[]
     else:
-      result = default(T)
       {.emit: [result, " = (*(", typeof(src[]), " volatile*)", src, ");"].}
 
 proc volatileStore*[T](dest: ptr T, val: T) {.inline.} =