Make sure that we use the canonical type for the names of instantiated
constructors and destructors. This is a requirement of
DeclarationNameTable::getCXXSpecialName that we weren't assert()'ing,
so it should have been caught much earlier :(

Big thanks to Anders for the test case.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@71895 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/AST/DeclarationName.cpp b/lib/AST/DeclarationName.cpp
index 15461bb..a17abde 100644
--- a/lib/AST/DeclarationName.cpp
+++ b/lib/AST/DeclarationName.cpp
@@ -302,7 +302,8 @@
   assert(Kind >= DeclarationName::CXXConstructorName &&
          Kind <= DeclarationName::CXXConversionFunctionName &&
          "Kind must be a C++ special name kind");
-  
+  assert(Ty->isCanonical() && 
+         "Can only build C++ special names from canonical types");
   llvm::FoldingSet<CXXSpecialName> *SpecialNames 
     = static_cast<llvm::FoldingSet<CXXSpecialName>*>(CXXSpecialNamesImpl);