Alastair Houghton 9ca81c63b1 [Backtracing] Massage the output a little in various cases. ...

We shouldn't try to erase the message when in non-color mode; mostly
that's intended for redirected output scenarios anyway, and in that case
we don't really want garbage in the output.

Also, improve the failure messages when the backtracer itself goes
wrong or can't be executed.

Finally, change the behaviour slightly so that *if* we're explicitly
enabled, *and* the backtracer path wasn't explicitly specified, *and*
we can't find the backtracer, we print a warning on start-up.  We
don't do that in any other case because we don't want spurious warnings
everywhere.

rdar://118055527

2023-11-09 18:12:18 +00:00

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