Make ll_convert() and ll_convert_to() use std::decay_t on arg type.

Among other things, this empowers ll_convert() and ll_convert_to() to accept a
string literal (which might contain non-ASCII characters, e.g. __FILE__).
Without this, even though we have ll_convert_impl specializations accepting
const char*, passing a string literal fails because the compiler can't find a
specialization specifically accepting const char[length].

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