Implement a %plural modifier for complex plural forms in diagnostics. Use it in the overload diagnostics.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@59871 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index ba1bb25..96b229d 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -1309,16 +1309,11 @@
       break;
 
     case OR_No_Viable_Function:
-      if (CandidateSet.empty())
-        Diag(Fn->getSourceRange().getBegin(), 
-             diag::err_ovl_no_viable_function_in_call)
-          << Ovl->getName() << Fn->getSourceRange();
-      else {
-        Diag(Fn->getSourceRange().getBegin(), 
-             diag::err_ovl_no_viable_function_in_call_with_cands)
-          << Ovl->getName() << Fn->getSourceRange();
-        PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
-      }
+      Diag(Fn->getSourceRange().getBegin(), 
+           diag::err_ovl_no_viable_function_in_call)
+        << Ovl->getName() << (unsigned)CandidateSet.size()
+        << Fn->getSourceRange();
+      PrintOverloadCandidates(CandidateSet, /*OnlyViable=*/false);
       return true;
 
     case OR_Ambiguous: