swift234

Introduce the formal protocol IntegerLiteralConvertible for integer literals.

This eliminates the last of the old "convert literal to specific type"
code, as all of the basic literal kinds now go directly through formal
protocols. One minor casualty of this change is that we've lost the
"integer constant too large" warning. Filed as
<rdar://problem/14070127>, which is likely to be addressed in SIL.


Swift SVN r5477