ntdll: trace arena magics (may help debugging some heap corruptions).

[Lionel_Debroux]

Helper patch made while trying to fix bug #10521 (patch is WIP).
By showing the invalid arena magic values, it can help spotting the
exact kind of overwrite that occurred. With WINEDEBUG=warn+heap, it
shows the overwrite with uninitialized newly allocated memory
(0x55555555) by the buggy msvcrt _aligned_realloc_offset.
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