Vendor import of clang r114020 (from the release_28 branch):

http://llvm.org/svn/llvm-project/cfe/branches/release_28@114020

Approved by:	rpaulo (mentor)

1 files changed, 7 insertions, 4 deletions

diff --git a/lib/AST/ASTDiagnostic.cpp b/lib/AST/ASTDiagnostic.cpp
index 0d609bf..23f323d 100644
--- a/lib/AST/ASTDiagnostic.cpp
+++ b/lib/AST/ASTDiagnostic.cpp
@@ -151,10 +151,13 @@ ConvertTypeToDiagnosticString(ASTContext &Context, QualType Ty,
     bool ShouldAKA = false;
     QualType DesugaredTy = Desugar(Context, Ty, ShouldAKA);
     if (ShouldAKA) {
-      S = "'"+S+"' (aka '";
-      S += DesugaredTy.getAsString(Context.PrintingPolicy);
-      S += "')";
-      return S;
+      std::string D = DesugaredTy.getAsString(Context.PrintingPolicy);
+      if (D != S) {
+        S = "'" + S + "' (aka '";
+        S += D;
+        S += "')";
+        return S;
+      }
     }
   }