Change const std::string & to StringRef in Lexer

[Rafael Espíndola]

LGTM

On 31 May 2015 at 15:56, Косов Евгений <claprix at yandex.ru> wrote:
> Hi.
>
> This is a small and boring patch. I'm checking a patch submitting process. Does it make sense to change more const string references in other part of LLVM?
>
> Eugene
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