[Feature Request] - Create benchmark for RegExp manipulation

[jasonwilliams]

In order to test the upcoming optimisation work we're doing around objects it would be good to have a benchmark for various objects and manipulating them.

In future we may change our underlying RegExp dependency, so it would be good to see what the effects are.

Example

Benchmarks live here
an array creation and access would be categorised under exec.

If exec benchmarks become too big we can compartmentalise them later on.

You can see the fibonacci benchmark here:
https://github.com/boa-dev/boa/blob/master/boa/benches/exec.rs#L49-L66

2 benchmarks could be made, 1 for using a RegExp object, another for creating one.
We could introduce more benchmarks here for various methods commonly used on RegExp objects.

in order to run the benchmarks you can run cargo bench in the root folder

Contributing

https://github.com/boa-dev/boa/blob/master/CONTRIBUTING.md
https://github.com/boa-dev/boa/blob/master/docs/debugging.md