test case for PR7920.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@111821 91177308-0d34-0410-b5e6-96231b3b80d8

test/CodeGenCXX/debug-info.cpp

@@ -50,3 +50,8 @@ namespace VirtualBase {
     B b;
   }
 }
+
+void foo() {
+  const wchar_t c = L'x';
+  wchar_t d = c;
+}