Avoid access to uninitialized memory in shared tidbitmap iteration.

Primarily, this didn't work correctly when the tidbitmap ended up
empty.

Dilip Kumar, per a report from Emre Hasegeli

Discussion: 
http://postgr.es/m/cafitn-ujhfkb8wslhk54rfqqt3r2yipqoyebrcdsa4p9fwp...@mail.gmail.com

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/80824ddda30154d56c9f40fe47dd1900d44ced32

Modified Files
--------------
src/backend/nodes/tidbitmap.c | 51 ++++++++++++++++++++++++++++---------------
1 file changed, 33 insertions(+), 18 deletions(-)


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