Add CXCursor support for LinkageSpecDecl (e.g., 'extern "C"').

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@103224 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index f221d16a..3d55a10 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -285,6 +285,7 @@
   // FIXME: ObjCCompatibleAliasDecl requires aliased-class locations.
   bool VisitObjCForwardProtocolDecl(ObjCForwardProtocolDecl *D);
   bool VisitObjCClassDecl(ObjCClassDecl *D);
+  bool VisitLinkageSpecDecl(LinkageSpecDecl *D);
   bool VisitNamespaceDecl(NamespaceDecl *D);
 
   // Type visitors
@@ -727,6 +728,10 @@
   return VisitDeclContext(D);
 }
 
+bool CursorVisitor::VisitLinkageSpecDecl(LinkageSpecDecl *D) {
+  return VisitDeclContext(D);
+}
+
 bool CursorVisitor::VisitBuiltinTypeLoc(BuiltinTypeLoc TL) {
   ASTContext &Context = TU->getASTContext();
 
@@ -1645,6 +1650,8 @@
     return createCXString("macro instantiation");
   case CXCursor_Namespace:
     return createCXString("Namespace");
+  case CXCursor_LinkageSpec:
+    return createCXString("LinkageSpec");
   }
 
   llvm_unreachable("Unhandled CXCursorKind");