[m-rev.] for review: renaming head variables fix

[Ralph Becket]

Zoltan Somogyi, Wednesday, 16 May 2007:
> 
> To avoid slowdowns from larger pred_infos, this diff also moves the least
> frequently used fields of pred_infos to a subterm. (Proc_infos already had
> a subterm.) This leads to an almost 3% speedup.

Wow!  This sort of thing happens often enough that it's a candidate for
FDO.
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