[m-rev.] for review: rename the .ll_debug grade component for hlc grades to .c_debug

[Julien Fischer]

On Tue, 27 Dec 2022, Zoltan Somogyi wrote:

> Does anyone intend to review this diff, or should I just commit it as is,
> without a resolution of the XXX in the log message?

Sorry, I assumed it had been reviewed.  I'll take a look at it.

Julien.