Revert "Fix accumulation of parallel worker instrumentation."

Robert Haas <rhaas@postgresql.org>

Commit: 7b3f85073c8dd470e01583b20269e7c87898b6f7
Author: Robert Haas <rhaas@postgresql.org>
Date: 2017-12-13T20:57:21Z
Releases: 10.2
Revert "Fix accumulation of parallel worker instrumentation."

This reverts commit 778e78ae9fa51e58f41cbdc72b293291d02d8984.  Per
further discussion, that doesn't seem to be the best possible fix.

Discussion: http://postgr.es/m/CAA4eK1LW2aFKzY3=vwvc=t-juzPPVWP2uT1bpx_MeyEqnM+p8g@mail.gmail.com

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