Fix IsUnderPostmaster/EXEC_BACKEND confusion

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 84f6fb81b8cb69c8da479d74e5b8078f6a1395c3
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2013-01-02T21:39:20Z
Releases: 9.3.0
Fix IsUnderPostmaster/EXEC_BACKEND confusion

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