[libclang] Put the RecursiveASTVisitor in libclang in a cxindex namespace.

llvm-svn: 156331
diff --git a/clang/tools/libclang/IndexBody.cpp b/clang/tools/libclang/IndexBody.cpp
index e1b9f2a..9a829f8 100644
--- a/clang/tools/libclang/IndexBody.cpp
+++ b/clang/tools/libclang/IndexBody.cpp
@@ -16,7 +16,7 @@
 
 namespace {
 
-class BodyIndexer : public RecursiveASTVisitor<BodyIndexer> {
+class BodyIndexer : public cxindex::RecursiveASTVisitor<BodyIndexer> {
   IndexingContext &IndexCtx;
   const NamedDecl *Parent;
   const DeclContext *ParentDC;