Previously, the result lines are not unique, for example
Running test simple-construction
Millions of constructed objects per second: 27.629
Running test simple-construction1
Millions of constructed objects per second: 151.879
...
That is undesirable, because we might want to parse the test results
with a script, and that's easier when the line is unique.
Change to:
Running test simple-construction
simple-construction: Millions of constructed objects per second: 27.629
Running test simple-construction1
simple-construction1: Millions of constructed objects per second: 151.879
...
65a59bde57