This PR improves the performance of the `@tailwindcss/postcss` plugin.
Before this change we created 2 compiler instances instead of a single
one. On a project where a `tailwindcss.config.ts` file is used, this
means that the timings look like this:
```
[@tailwindcss/postcss] Setup compiler: 137.525ms
⋮
[@tailwindcss/postcss] Setup compiler: 43.95ms
```
This means that with this small change, we can easily shave of ~50ms for
initial PostCSS builds.
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Co-authored-by: Philipp Spiess <hello@philippspiess.com>
Co-authored-by: Jordan Pittman <jordan@cryptica.me>
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