Say 'decltype(auto)' not 'auto' as appropriate in mismatched-deduction diagnostic.

llvm-svn: 181103
diff --git a/clang/lib/Sema/SemaDecl.cpp b/clang/lib/Sema/SemaDecl.cpp
index f5b4823..f782677 100644
--- a/clang/lib/Sema/SemaDecl.cpp
+++ b/clang/lib/Sema/SemaDecl.cpp
@@ -8212,6 +8212,7 @@
           } else if (DeducedCanon != UCanon) {
             Diag(D->getTypeSourceInfo()->getTypeLoc().getBeginLoc(),
                  diag::err_auto_different_deductions)
+              << (AT->isDecltypeAuto() ? 1 : 0)
               << Deduced << DeducedDecl->getDeclName()
               << U << D->getDeclName()
               << DeducedDecl->getInit()->getSourceRange()