[poppler] Caching more ObjectStream

[Albert Astals Cid]

Hi, this patch makes opening of file in bug 26759 go down from around 15 secs 
to 1.5 secs by caching more ObjectStream objects. Obviously some more memory 
is used but i think a 10x speed is worth it.

Any objection to commit it to both master and 0.14 branches?

Albert
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