Create a new expression node, SubstNonTypeTemplateParmExpr,
to represent a fully-substituted non-type template parameter.
This should improve source fidelity, as well as being generically
useful for diagnostics and such.

llvm-svn: 135243
diff --git a/clang/lib/AST/ItaniumMangle.cpp b/clang/lib/AST/ItaniumMangle.cpp
index b07e962..ec9863b 100644
--- a/clang/lib/AST/ItaniumMangle.cpp
+++ b/clang/lib/AST/ItaniumMangle.cpp
@@ -2279,6 +2279,11 @@
     mangleExpression(cast<CXXDefaultArgExpr>(E)->getExpr(), Arity);
     break;
 
+  case Expr::SubstNonTypeTemplateParmExprClass:
+    mangleExpression(cast<SubstNonTypeTemplateParmExpr>(E)->getReplacement(),
+                     Arity);
+    break;
+
   case Expr::CXXMemberCallExprClass: // fallthrough
   case Expr::CallExprClass: {
     const CallExpr *CE = cast<CallExpr>(E);