Comment parsing: resolve more named character references

This reimplements r173850 with a better approach:
(1) use a TableGen-generated matcher instead of doing a linear search;
(2) avoid allocations for new strings by converting code points to string
    iterals with TableGen.

llvm-svn: 173931
diff --git a/clang/lib/AST/CMakeLists.txt b/clang/lib/AST/CMakeLists.txt
index 923c519..328f385 100644
--- a/clang/lib/AST/CMakeLists.txt
+++ b/clang/lib/AST/CMakeLists.txt
@@ -68,6 +68,7 @@
   ClangCommentNodes
   ClangCommentHTMLTags
   ClangCommentHTMLTagsProperties
+  ClangCommentHTMLNamedCharacterReferences
   ClangDeclNodes
   ClangDiagnosticAST
   ClangDiagnosticComment