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Re: (ITS#7623) P_SUBP page inn MDB dirty_list

I wrote:
>Howard Chu writes:
>> Obviously this and the preceding line can be reduced to
>> 	mp->mp_flags = fp->mp_flags ^ (P_DIRTY|P_SUBP|P_FAKE);
> They are not equivalent.  fp->mp_flags can be P_LEAF|P_DIRTY in branch
> "yes, convert it" and P_LEAF|P_DIRTY|P_SUBP|P_FAKE in the other branch.

Found by test043 + assert(the patches were equivalent).