What is the purpose of EXTENT_PAGE_MAPPED

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Subject: What is the purpose of EXTENT_PAGE_MAPPED
From: Goldwyn Rodrigues <rgoldwyn@xxxxxxx>
Date: Tue, 24 Oct 2017 05:47:11 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

EXTENT_PAGE_MAPPED gets set in set_page_extent_mapped(), but I don't see
it being cross checked anytime. What is the purpose of setting it?

-- 
Goldwyn
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