Improve performance of -profile by factor of 10

[Martin Nowak]

On 03/25/2013 11:37 PM, Sean Kelly wrote:
> On Mar 22, 2013, at 3:39 PM, Walter Bright <newshound2 at digitalmars.com> wrote:
>
>> http://d.puremagic.com/issues/show_bug.cgi?id=9787
>>
>> This can be a fun little project, with a nice payoff. Any takers?
>
> Bonus points if the code is made multithread capable.  When I was thinking about this before, the correct approach seemed to be tracking profile data on a per-thread basis and then merging results into final on thread termination.
>
Good to know and sounds fairly trivial.