Remove ambiguity for jsonb_path_match() and jsonb_path_exists()

Alexander Korotkov <akorotkov@postgresql.org>

Commit: 641fde25233ef3ecc3b8101fe287eea9fceba6fd
Author: Alexander Korotkov <akorotkov@postgresql.org>
Date: 2019-03-20T07:30:56Z
Releases: 12.0
Remove ambiguity for jsonb_path_match() and jsonb_path_exists()

There are 2-arguments and 4-arguments versions of jsonb_path_match() and
jsonb_path_exists().  But 4-arguments versions have optional 3rd and 4th
arguments, that leads to ambiguity.  In the same time 2-arguments versions are
needed only for @@ and @? operators.  So, rename 2-arguments versions to
remove the ambiguity.

Catversion is bumped.

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