math.log() benchmark of first 1 billion int using std.parallelism

[Iov Gherman via Digitalmars-d-learn]

> Btw. I just noticed small issue with D vs. java, you start 
> messure in D before allocation, but in case of Java after 
> allocation

Here is the java result for parallel processing after moving the 
start time as the first line in main. Still best result:

4 secs, 50 ms average