Replace core language HexStrings with library entity

[Baz via Digitalmars-d]

On Sunday, 15 March 2015 at 21:40:02 UTC, Walter Bright wrote:
> On 3/15/2015 2:34 PM, Walter Bright wrote:
>> P.S. Also need to include all the examples in the dlang 
>> reference as unittest
>> cases.
>
> Also, HexStrings can handle w and d postfixes. Use the lexer.c 
> code for TOK::hexStringConstant() as a guide to be sure all the 
> permutations are covered.

Hi, i propose this:

https://github.com/D-Programming-Language/phobos/pull/3058