[PATCH] Remove all ggc'd bitmaps from PRE (Was Re: Memory overhead of tree-SSA optimization passes)

[Daniel Berlin]

> For PRE we consume most of memory in bitmaps, I am just testing patch
> obstackeizing them that should actually help here reducing GGC garbage
> to 40MB but still I don't follow why we need such an extreme amount of
> bitmaps.

Here's a patch that removes all ggc'd bitmaps from PRE.

It's bootstrapping now (on a day old tree).
If all goes well, i'll rebootstrap and testwhen the tree isn't broken,
add a changelog, and commit it.

However, in any case, it should be usable for your measurement purposes.

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