Removed some unnecessary casts that were inserted around a default value of a type even if the type could be inferred from the default value.  The only case where it cannot be inferred is with regards to classes where the default value of all class types is nil.
Removed some unnecessary casts that were inserted around a default
value of a type even if the type could be inferred from the default
value.  The only case where it cannot be inferred is with regards to
classes where the default value of all class types is nil.


git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@8975 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel,sungeunchoi/chapel,sungeunchoi/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel,CoryMcCartan/chapel,chizarlicious/chapel,sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel,sungeunchoi/chapel,chizarlicious/chapel,hildeth/chapel