Split Objective-C keyword parsing to handle the '@' separately.
Because apparently, while designing the Objective-C language, somebody thought it was a world-class idea to allow any white-space between the '@' character and the subsequent keyword. With this fix, we now correctly parse: @ dynamic and: @ selector and: @"foo" "bar" @"mooze" (This last one is 1 single string split over multiple lines.) Wonderful, isn't it? What we (and Clang) do not support, but what GCC supports is something like: @"foo"@@ "bar" @"mooze" @@ which is equivalent to @"foobarmooze".
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