Use macro NUM_MERGE_MATCH_KINDS instead of '3' in MERGE code.

Code quality improvement for 0294df2f1f84.

Aleksander Alekseev, reviewed by Richard Guo.

Discussion: 
https://postgr.es/m/CAJ7c6TMsiaV5urU_Pq6zJ2tXPDwk69-NKVh4AMN5XrRiM7N%2BGA%40mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/2e068db56e31dfb510fe7416e52b7affe26f278f

Modified Files
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src/backend/optimizer/prep/prepjointree.c | 2 +-
src/backend/parser/parse_merge.c          | 2 +-
src/include/nodes/execnodes.h             | 2 +-
src/include/nodes/primnodes.h             | 2 ++
4 files changed, 5 insertions(+), 3 deletions(-)

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