-freference-trace can work without colors

[gwenzek]

Currently -freference-trace only works when running from a terminal. This is annoying if you're running in another environment or if you redirect the output. But -freference-trace also works fine without the color, so just changing how the build runner is interpreting this option.

[alexrp]

This needs a rebase to deal with the merge conflict.

[gwenzek]

I've rebased on top of master. Ready for the 0.14.0 release :-)

CI is green so far, just waiting on aarch64 CI.

[gwenzek]

All green :-)

[gwenzek]

@andrewrk Can I have your eyes on this ? the history indicates you're the main contributor of this part of the compiler. I tried to find another volunteer to review this on Zulip but wasn't able to.

[gwenzek]

Thanks !