Merge pull request #2 from sbabbi/master

Improvements in dfsPointerUsageFlagsComplete + no wrapping array opt
Do not collapse multiple stores to memset on Duetto
DuettoBackend: Implement the unreachable opcode
DuettoBackend: Minor fix to pointer offset intrinsic
DuettoBackend: Added debug utility printPointerInfo
DuettoBackend: pointer function arguments optimized to be non-REGULAR if possible