Fix dhat support for turbo dev

Build next-swc using the dhat feature:

pnpm pack-next --features __internal_dhat-heap

Testing with dev

pnpm dev --turbo

Hit ctrl+c, and see the dhat output:

[dhat]: Teardown profiler
dhat: Total:     10,246,437 bytes in 84,934 blocks
dhat: At t-gmax: 4,129,935 bytes in 42,733 blocks
dhat: At t-end:  4,118,268 bytes in 42,728 blocks
dhat: The data has been saved to dhat-heap.json, and is viewable with dhat/dh_view.html

Check that we didn't regress turbotrace

Modify a project's next.config.mjs to enable turbotrace:

  experimental: {
    turbotrace: {}
  }

run pnpm build and see that we get output from dhat at the end:

dhat: Total:     108,876,305 bytes in 716,123 blocks
dhat: At t-gmax: 53,145,524 bytes in 338,440 blocks
dhat: At t-end:  53,145,524 bytes in 338,440 blocks
dhat: The data has been saved to dhat-heap.json, and is viewable with dhat/dh_view.html

vercel / next.js

Fix dhat support for turbo dev #67166

Testing with dev

Check that we didn't regress turbotrace