Change const std::string & to StringRef in Lexer

[Косов Евгений]

Sorry for my inattension.

I actually have 2 patches for clang Lex and for clang-tools-extra which build needs to be fixed after applying the first patch.

01.06.2015, 17:12, "Rafael Espíndola" <rafael.espindola at gmail.com>:
> For the first few patches you just ask someone to commit it.
>
> In this case, two things I noticed when I applied the patch:
>
> * It is for clang, so you should send it to cfe-commits.
> * It is incomplete. Looks like you only included the header changes:
>
> llvm/tools/clang/lib/Lex/PTHLexer.cpp:434:25: error: out-of-line
> definition of 'Create' does not match any declaration in
> 'clang::PTHManager'
> PTHManager *PTHManager::Create(const std::string &file,
>
> On 1 June 2015 at 02:27, Косов Евгений <claprix at yandex.ru> wrote:
>>  Cool. Thanks for reviewing. How now can I commit this patch into trunk?
>>
>>  Eugene
>>
>>  01.06.2015, 03:12, "Rafael Espíndola" <rafael.espindola at gmail.com>:
>>>  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
>>>>   _______________________________________________
>>>>   llvm-commits mailing list
>>>>   llvm-commits at cs.uiuc.edu
>>>>   http://lists.cs.uiuc.edu/mailman/listinfo/llvm-commits

Eugene
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