swift234

generalize integer literals to allow conversion functions to go 
through 1 level of indirection in literal conversions.  This allows the
testcase to define its "convert_from_integer_literal" function in terms
of the library 'int' type instead of requiring them to always be defined
in terms of Builtin:: types.  We get the expected chained conversion calls 
in the AST.
 


Swift SVN r957