Define strnlen when it is not in libc

[Duncan P. N. Exon Smith via llvm-commits]

> On 2016-Nov-24, at 11:10, Joerg Sonnenberger via llvm-commits <llvm-commits at lists.llvm.org> wrote:
> 
> On Thu, Nov 24, 2016 at 02:06:55PM -0500, Chi-Hua Chen via llvm-commits wrote:
>> Some older platforms, e.g. Mac 10.6.8, do not have strnlen. Define one
>> in Support when necessary.
> 
> Personally, I'd prefer to just avoid it in first place. It is not really
> much simpler than just using memchr.

`StringRef(...).find('\0')` seems cleaner.

> 
> Joerg
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