enlarge hot allocation pools

[Dimitrios Apostolou <jimis at gmx dot net>]

Hello,

2012-08-19  Dimitrios Apostolou  <jimis@gmx.net>

	* gcc/cselib.c (cselib_init): Make allocation pools larger since
	they are too hot and show to expand often on the profiler.
	* gcc/df-problems.c (df_chain_alloc): Same.
	* gcc/et-forest.c (et_new_occ, et_new_tree): Same.
	* gcc/tree-ssa-pre.c (init_pre): Same


These allocation pools are the ones that I've noticed calling malloc() too 
often, for expanding their size. Also I don't like the way the pools are 
created in et_new_{occ,tree}() but couldn't find a single point to move 
the initialisation either. Any ideas on this one?


Thanks,
Dimitris

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