Some renames in indexer. Fix warning for namespace alias.

src/indexer.cc

@@ -1350,6 +1350,7 @@ void indexEntityReference(CXClientData client_data,
   // std::endl;
 
   switch (ref->referencedEntity->kind) {
+    case CXIdxEntity_CXXNamespaceAlias:
     case CXIdxEntity_CXXNamespace: {
       // We don't index namespace usages.
       break;

tests/namespaces/namespace_alias.cc

@@ -0,0 +1,56 @@
+namespace foo {
+    namespace bar {
+         namespace baz {
+             int qux = 42;
+         }
+    }
+}
+ 
+namespace fbz = foo::bar::baz;
+
+void foo() {
+  int a = foo::bar::baz::qux;
+  int b = fbz::qux;
+}
+
+/*
+OUTPUT:
+{
+  "funcs": [{
+      "id": 0,
+      "usr": "c:@F@foo#",
+      "short_name": "foo",
+      "detailed_name": "void foo()",
+      "definition_spelling": "11:6-11:9",
+      "definition_extent": "11:1-14:2"
+    }],
+  "vars": [{
+      "id": 0,
+      "usr": "c:@N@foo@N@bar@N@baz@qux",
+      "short_name": "qux",
+      "detailed_name": "int foo::bar::baz::qux",
+      "definition_spelling": "4:18-4:21",
+      "definition_extent": "4:14-4:26",
+      "is_local": false,
+      "uses": ["4:18-4:21", "12:26-12:29", "13:16-13:19"]
+    }, {
+      "id": 1,
+      "usr": "c:namespace_alias.cc@167@F@foo#@a",
+      "short_name": "a",
+      "detailed_name": "int a",
+      "definition_spelling": "12:7-12:8",
+      "definition_extent": "12:3-12:29",
+      "is_local": true,
+      "uses": ["12:7-12:8"]
+    }, {
+      "id": 2,
+      "usr": "c:namespace_alias.cc@198@F@foo#@b",
+      "short_name": "b",
+      "detailed_name": "int b",
+      "definition_spelling": "13:7-13:8",
+      "definition_extent": "13:3-13:19",
+      "is_local": true,
+      "uses": ["13:7-13:8"]
+    }]
+}
+*/