Обсуждение: pgsql: Remove RelationSetIndexList().

Remove RelationSetIndexList().

In the wake of commit f912d7dec, RelationSetIndexList isn't used any
more.  It was always a horrid wart, so getting rid of it is very nice.
We can also convert rd_indexvalid back to a plain boolean.

Discussion: https://postgr.es/m/28926.1556664156@sss.pgh.pa.us

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/f884dca4959f64bd47e78102d1dadd2c77d49201

Modified Files
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src/backend/utils/cache/relcache.c | 90 +++++---------------------------------
src/include/utils/rel.h            |  4 +-
src/include/utils/relcache.h       |  3 --
3 files changed, 12 insertions(+), 85 deletions(-)