Implement code completion for @selector expressions

llvm-svn: 112186
diff --git a/clang/lib/Frontend/ASTUnit.cpp b/clang/lib/Frontend/ASTUnit.cpp
index 874fd01..851c666 100644
--- a/clang/lib/Frontend/ASTUnit.cpp
+++ b/clang/lib/Frontend/ASTUnit.cpp
@@ -1554,6 +1554,7 @@
   case CodeCompletionContext::CCC_PreprocessorExpression:
   case CodeCompletionContext::CCC_PreprocessorDirective:
   case CodeCompletionContext::CCC_NaturalLanguage:
+  case CodeCompletionContext::CCC_SelectorName:
     // We're looking for nothing, or we're looking for names that cannot
     // be hidden.
     return;