[PATCH]: Heapify new points-to analyzer

[Daniel Berlin]

The attached converts the new points-to analyzer to use heap vector
instead of gc'd ones.
No functional changes have been made.

Bootstrapped and regtested on i686-pc-linux-gnu (and valgrind'd on some
heavy points-to users to make sure i didn't introduce any leaks or mem
corruption).

Committed to mainline.


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