[GHC] #13033: GHC Panics with "colorGraph: trivially colorable nodes didn't color!" on PPC

[GHC]

#13033: GHC Panics with "colorGraph: trivially colorable nodes didn't color!" on
PPC
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        Reporter:  hvr               |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  AIX               |         Architecture:  powerpc
 Type of failure:  Compile-time      |            Test Case:
  crash or panic                     |
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * version:  8.0.2-rc2 => 8.1


Comment:

 This is due to 6a5d13c4ade5bbb84873970065a1acd1546f6c31, which restored
 the function of `-fregs-graph`, which was previously broken due to #7679
 and #8657. Given that `-fregs-graph` is broken-ish anyways (see #7679) I'm
 going to revert on `ghc-8.0`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13033#comment:2>
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