Set LangOpts.ObjC1 to 1 in clang-format.

This matches the test change done in clang at r171742. Without this,
clang-format would strip '@' characters and format e.g. '@interface' as
'interface'.

llvm-svn: 171743

clang-tools-extra/clang-format/ClangFormat.cpp

@@ -61,6 +61,7 @@ static void format() {
   LangOptions LangOpts;
   LangOpts.CPlusPlus = 1;
   LangOpts.CPlusPlus11 = 1;
+  LangOpts.ObjC1 = 1;
   Lexer Lex(ID, Sources.getBuffer(ID), Sources, LangOpts);
   SourceLocation Start =
       Sources.getLocForStartOfFile(ID).getLocWithOffset(Offset);