Smt backend - #223
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Part 1 of the smt backend, yay!
Adds a summary inlining transform which replaces all procedure summaries with asserts/assumes.
Uses this in the dump-smt command, which outputs an smt file that can currently verify basic IL programs (pure and only using primitive types). Support for fancy things like datatypes/matching are not done yet. Should be structured to check that all assertions/ensures are satisfied.
Also makes some changes to the existing smt infrastructure. Fixes some bugs with incorrect symbols for bitvector operations, and makes a mess getting ITEs working (there has to be a better way??).