Fix bug in parallel tidbitmap iteration.

Avoid computing idxpages[istate->spageptr] until after checking
that istate->spageptr is a legal index.

Dilip Kumar, per a report from David Rowley

Discussion: 
http://postgr.es/m/CAKJS1f8OtrHE+-P+=E=4ycnl29e9idzkuatq6o2mbhvgn9d...@mail.gmail.com

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/6a468c343b31aabead7d3a5e11079bfcddbfd667

Modified Files
--------------
src/backend/nodes/tidbitmap.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)


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