swift234

Introduce OverloadedExpr, a wrapper around an expression that provides
the semantics of an overloaded declaration, either because it is a
reference to a set of overloaded declarations or because it is a
reference to a generic function, either of which can be optionally
parenthesized. The basic intent is to avoid the dual
DeclRefExpr/OverloadSetRefExpr paths that trigger overload resolution
for a call, but as a side effect this allows overload resolution to
work when the function itself is parenthesized. Fixes
<rdar://problem/10616741>.


Swift SVN r2291