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    Michael Paquier authored
    This can cause valgrind to complain, as the flag marking a buffer as a
    temporary copy was not getting initialized.
    
    While on it, fill in with zeros newly-created buffer pages.  This does
    not matter when loading a block from a temporary file, but it makes the
    push of an index tuple into a new buffer page safer.
    
    This has been introduced by 1d27dcf5, so backpatch all the way down to
    9.4.
    
    Author: Alexander Lakhin
    Discussion: https://postgr.es/m/15899-0d24fb273b3dd90c@postgresql.org
    Backpatch-through: 9.4
    6365f3ca
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