[clang-format] Don't add a space before Obj-C selector methods that are also clang-format keywords

[keith]

Summary

The following Obj-C methods will get formatted with an extra space between the right paren and the name:

- (void)delete:(id)sender
- (void)export:(id)sender

So they'll incorrectly appear as:

- (void) delete:(id)sender
- (void) export:(id)sender

The fix is to check if the token is a TT_SelectorName instead of tok::identifier. That way keywords recognized by clang-format still get treated as an Obj-C method name (because they're both a TT_SelectorName and tok::delete type).

[keith]

Note the test case shown here passes on master, so we can drop this

lib/Format/TokenAnnotator.cpp

   if (Line.Type == LT_ObjCMethodDecl) {
     if (Left.is(TT_ObjCMethodSpecifier))
       return true;
-    if (Left.is(tok::r_paren) && Right.is(tok::identifier))
+    if (Left.is(tok::r_paren) && Right.is(TT_SelectorName))
       // Don't space between ')' and <id>
       return false;
   }

unittests/Format/FormatTest.cpp

                "                         y:(id<yyyyyyyyyyyyyyyyyyyy>)y\n"
                "    NS_DESIGNATED_INITIALIZER;",
                getLLVMStyleWithColumns(60));
+  verifyFormat("- (void)delete:(id)sender\n");
 
   // Continuation indent width should win over aligning colons if the function
   // name is long.