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Remove obsolete comments about sempahores from proc.c.

Thomas Munro <tmunro@postgresql.org>

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Commit: f7aebd7f74117a9b44eb6af575061fc16a728236
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2019-06-20T22:57:32Z
Releases: 11.5 
Remove obsolete comments about sempahores from proc.c.

Commit 6753333f switched from a semaphore-based wait to a latch-based
wait for ProcSleep()/ProcWakeup(), but left behind some stray references
to semaphores.

Back-patch to 9.5.

Reviewed-by: Daniel Gustafsson, Michael Paquier
Discussion: https://postgr.es/m/CA+hUKGLs5H6zhmgTijZ1OaJvC1sG0=AFXc1aHuce32tKiQrdEA@mail.gmail.com

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PathChange+/−
src/backend/storage/lmgr/proc.c modified +6 −8

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