Thread: pgsql: Move functions related to index maintenance to separate source f

Move functions related to index maintenance to separate source file.

There is enough code here to deserve a file of their own, not be buried
in the middle of execUtils.c.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/62420ae7d6675453a48e408b62030b6f0780e878

Modified Files
--------------
src/backend/executor/Makefile       |    4 +-
src/backend/executor/execIndexing.c |  541 +++++++++++++++++++++++++++++++++++
src/backend/executor/execUtils.c    |  534 +---------------------------------
src/include/executor/executor.h     |   16 +-
4 files changed, 555 insertions(+), 540 deletions(-)