Structured comment parsing, first step.

* Retain comments in the AST
* Serialize/deserialize comments
* Find comments attached to a certain Decl
* Expose raw comment text and SourceRange via libclang


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@158771 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/unittests/Frontend/Makefile b/unittests/Frontend/Makefile
index f3e6396..357e242 100644
--- a/unittests/Frontend/Makefile
+++ b/unittests/Frontend/Makefile
@@ -14,6 +14,6 @@
            clangSerialization.a clangCodeGen.a clangParse.a clangSema.a \
            clangStaticAnalyzerCheckers.a clangStaticAnalyzerCore.a \
            clangARCMigrate.a clangRewrite.a clangEdit.a \
-           clangAnalysis.a clangAST.a clangLex.a clangBasic.a
+           clangAnalysis.a clangAST.a clangLex.a clangComments.a clangBasic.a
 
 include $(CLANG_LEVEL)/unittests/Makefile