Suppress complaints about leaks in function cache loading.

PL/pgSQL and SQL-function parsing leak some stuff into the long-lived
function cache context.  This isn't really a huge practical problem,
since it's not a large amount of data and the cruft will be recovered
if we have to re-parse the function.  It's not clear that it's worth
working any harder than the previous patch did to eliminate these
leak complaints, so instead silence them with a suppression rule.

This suppression rule also hides the fact that CachedFunction structs
are intentionally leaked in some cases because we're unsure if any
fn_extra pointers remain.  That might be nice to do something about
eventually, but it's not clear how.

Author: Tom Lane <t...@sss.pgh.pa.us>
Reviewed-by: Andres Freund <and...@anarazel.de>
Discussion: https://postgr.es/m/285483.1746756...@sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/2c7b4ad24dda86a73d80df063e9a56c3ecb1e4bb

Modified Files
--------------
src/tools/valgrind.supp | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)

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