[GHC] #15000: Add a linter for debug information (-g)

[GHC]

#15000: Add a linter for debug information (-g)
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        Reporter:  niteria           |                Owner:  niteria
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
Operating System:  Linux             |         Architecture:  x86_64
 Type of failure:  Debugging         |  (amd64)
  information is incorrect           |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Description changed by niteria:

Old description:

> There are some sanity checks we can do.
>
> For example if you see following Cmm:
>
> {{{
> unwind Sp = Sp + 16
> Sp = Sp + 16
> unwind Sp = Sp + 64
> }}}
>
> You can tell that it's wrong because it's clear how `Sp` changed between
> the two unwind points.
>
> I think this would fit well with the Cmm linter.

New description:

 There are some sanity checks we can do.

 For example if you see the following Cmm:

 {{{
 unwind Sp = Just Sp + 16;
 Sp = Sp + 16;
 unwind Sp = Just Sp + 64;
 }}}

 You can tell that it's wrong because it's clear how `Sp` changed between
 the two unwind points.

 I think this would fit well with the Cmm linter.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15000#comment:2>
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