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restructured to modularize libIRDB, and also added the CFG module for building a control flow graph of a function.

Started using attribute output

Reorganized current libIRDB into a library for the CORE functionality.  Hope is to add a second library for CFG building.

Cleanup code

Integer bug transform to monitor add/sub overflows

- out args region size
- use frame pointer
- IR DB-driven P1 transform (Katie's work)

- keeping track of out args region size
- keeping track of indirect branch targets

Better support for indirect branch targets in instructions

Added overflow detector for imul & mul