Avoid compiler warning in non-assert builds.

After 3c90dcd03, try_partitionwise_join's child_joinrelids
variable is read only in an Assert, provoking a compiler
warning in non-assert builds.  Rearrange code to avoid the
warning and eliminate unnecessary work in the non-assert case.

Per CI testing (via Jeff Davis and Bharath Rupireddy)

Discussion: 
https://postgr.es/m/[email protected]

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/bda97e47afaeaab6236f37993ce45bb369add3e5

Modified Files
--------------
src/backend/optimizer/path/joinrels.c | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)

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