Make ALTER DOMAIN VALIDATE CONSTRAINT no-op when constraint is already validated

Currently, AlterDomainValidateConstraint will re-validate a constraint
that has already been validated, which would just waste cycles.  This
operation should be a no-op when the constraint is already validated.
This also aligns with ATExecValidateConstraint.

Author: jian he <[email protected]>
Discussion: 
https://postgr.es/m/CACJufxG=-dv9fpjhqka9c-wgz2ddowoxsp-x-0k_g7r-dga...@mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a99c6b56ffa74dae49e6847cc6c113d000c8ebd0

Modified Files
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src/backend/commands/typecmds.c | 44 +++++++++++++++++++++++------------------
1 file changed, 25 insertions(+), 19 deletions(-)

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