Add EXPLAIN support for JIT.
This just shows a few details about JITing, e.g. how many functions
have been JITed, and how long that took. To avoid noise in regression
tests with functions sometimes being JITed in --with-llvm builds,
disable display when COSTS OFF is specified.
Author: Andres Freund
Discussion: https://postgr.es/m/
20170901064131.tazjxwus3k2w3ybh@alap3.anarazel.de