[m-dev.] proposal: remove hlc_nest and hl_nest grades

[Julien Fischer]

Hi,

Are there any objections to removing support for the hlc_nest( and
hl_nest* grades?  (i.e. high-level C with GCC nested functions).

While they were (presuambly) useful in the past for evaluating various
design decisions in the MLDS backend, they haven't been used (or even
documented) for quite a while now.

Additionally, GCC's support for nested functions was a bit flakey last I
looked, so I can't really see anyone ever wanting to use these grades in
anger.

Julien.