Talkative Join points warning

[Ben Gamari]

Hi Luke,

I've noticed that a new WARN in OccurAnal seems to be quite loud.
Validations now produce thousands of lines of the form,

    WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
      OccurAnal failed to rediscover join point(s): [$j_shTG]
    WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
      OccurAnal failed to rediscover join point(s): [$w$j_sl22]
    WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
      OccurAnal failed to rediscover join point(s): [$w$j_sl1W]
    WARNING: file compiler/simplCore/OccurAnal.hs, line 2633
      OccurAnal failed to rediscover join point(s): [$w$j_sl1Q]

Do you think we could either quiet the warning down a bit or perhaps
disable it by default? It makes it rather difficult to see through the
noise.

This is actually perhaps another case where Simon Marlow suggestion of
introducing a family of -v* flags (e.g. -fvanishing-join-points) might
be helpful.

Cheers,

- Ben
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