[clang-format] Fix namespace end comments in ObjC++ files too

[thakis]

Summary

See also d96ae867351ec.

clang/lib/Format/Format.cpp

Passes.emplace_back([&](const Environment &Env) {
       return BracesInserter(Env, Expanded).process();
     });
 
   if (Style.isCpp() && Style.RemoveBracesLLVM)
     Passes.emplace_back([&](const Environment &Env) {
       return BracesRemover(Env, Expanded).process();
     });
 
-  if (Style.Language == FormatStyle::LK_Cpp) {
+  if (Style.isCpp()) {
     if (Style.FixNamespaceComments)
       Passes.emplace_back([&](const Environment &Env) {
         return NamespaceEndCommentsFixer(Env, Expanded).process();
       });
 
     if (Style.SortUsingDeclarations)
       Passes.emplace_back([&](const Environment &Env) {
         return UsingDeclarationsSorter(Env, Expanded).process();

clang/unittests/Format/FormatTest.cpp

EXPECT_EQ("FOO(String-ized=&Messy+But,: :\n"
                    Style));
 
   Style.ColumnLimit = 21;
   EXPECT_EQ("FOO(String-ized&Messy+But: :Still=Intentional);",
             format("FOO(String-ized&Messy+But: :Still=Intentional);", Style));
 }
 
 TEST_F(FormatTest, VeryLongNamespaceCommentSplit) {
-  // These tests are not in NamespaceFixer because that doesn't
+  // These tests are not in NamespaceEndCommentsFixerTest because that doesn't
   // test its interaction with line wrapping
   FormatStyle Style = getLLVMStyleWithColumns(80);
   verifyFormat("namespace {\n"
                "int i;\n"
                "int j;\n"
                "} // namespace",
                Style);
 

clang/unittests/Format/NamespaceEndCommentsFixerTest.cpp

EXPECT_EQ("namespace A {\n"
             "// unrelated",
             fixNamespaceEndComments("namespace A {\n"
                                     "int i;\n"
                                     "int j;\n"
                                     "};\n"
                                     "// unrelated"));
 }
 
+TEST_F(NamespaceEndCommentsFixerTest, WorksForObjCpp) {
+  FormatStyle ObjCppStyle = getLLVMStyle();
+  ObjCppStyle.Language = FormatStyle::LK_ObjC;
+  EXPECT_EQ("namespace {\n"
+            "int i;\n"
+            "int j;\n"
+            "}// namespace",
+            fixNamespaceEndComments("namespace {\n"
+                                    "int i;\n"
+                                    "int j;\n"
+                                    "}", ObjCppStyle));
+}
+
 TEST_F(NamespaceEndCommentsFixerTest, AddsMacroEndComment) {
   FormatStyle Style = getLLVMStyle();
   Style.NamespaceMacros.push_back("TESTSUITE");
 
   EXPECT_EQ("TESTSUITE() {\n"
             "int i;\n"
             "int j;\n"
             "}// TESTSUITE()",