Remove function specifiers 'inline' and '_Noreturn' and their associated grammar/rules
Remove storage class specifier '_Thread_local' and associated grammar/rules
Remove type specifiers 'signed' and 'unsigned' and associated grammar/rules
Remove type specifiers '_Imaginary' and '_Complex' and associated grammar/rules
Remove type specifier '_Atomic' and associated grammar/rules
Remove alignment specifier '_Alignas' and '_Alignof' and associated grammar/rules
Remove type specifiers 'volatile' and 'restrict' and associated grammar/rules
Remove keyword '_Static_assert' and 'static_assert_declaration' associated grammar/rules