Improve overloaded function handling in the typo correction code.

Change TypoCorrection to store a set of NamedDecls instead of a single
NamedDecl. Also add initial support for performing function overload
resolution to Sema::DiagnoseEmptyLookup.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@136807 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaOverload.cpp b/lib/Sema/SemaOverload.cpp
index 79aa305..712720b 100644
--- a/lib/Sema/SemaOverload.cpp
+++ b/lib/Sema/SemaOverload.cpp
@@ -8220,7 +8220,8 @@
   if (!DiagnoseTwoPhaseLookup(SemaRef, Fn->getExprLoc(), SS, R,
                               ExplicitTemplateArgs, Args, NumArgs) &&
       (!EmptyLookup ||
-       SemaRef.DiagnoseEmptyLookup(S, SS, R, Sema::CTC_Expression)))
+       SemaRef.DiagnoseEmptyLookup(S, SS, R, Sema::CTC_Expression,
+                                   Args, NumArgs)))
     return ExprError();
 
   assert(!R.empty() && "lookup results empty despite recovery");