[Benchmark] Added new closure 7.0 style into the benchmark suite

[lyrixx]

Results:

closure-instantiation.php - 1000000 iterations - 0.56754 sec
closure-70-instantiation.php - 1000000 iterations - 0.17231 sec
reflection-instantiation.php - 1000000 iterations - 0.76572 sec
closure-read.php - 1000000 iterations - 0.09967 sec
closure-70-read.php - 1000000 iterations - 0.25495 sec
reflection-read.php - 1000000 iterations - 0.21059 sec
closure-write.php - 1000000 iterations - 0.11212 sec
closure-70-write.php - 1000000 iterations - 0.29857 sec
reflection-write.php - 1000000 iterations - 0.21671 sec

[Ocramius]

@lyrixx 👍