Profiling build defaults

@bitemyapp's Makefiles are a treasure trove of build tips. [Here's a trick for profiling builds](https://github.com/fpco/badgers/blob/master/Makefile#L9-L13):

```
stack build --profile --work-dir .stack-work-profiling
```

This tremendously improves build caching, at the expense of disk space.

Can this be a default behavior, or at least, enabled via a global config flag or similar? It is soul crushing to have to rebuild all of the deps for a large project for profiling, and rebuild them *again* for normal mode.