[GHC] #8657: -fregs-graph still has a limit on spill slots

[GHC]

#8657: -fregs-graph still has a limit on spill slots
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       Reporter:  simonmar         |             Owner:
           Type:  bug              |            Status:  new
       Priority:  normal           |         Milestone:  7.8.1
      Component:  Compiler (NCG)   |           Version:  7.7
       Keywords:                   |  Operating System:  Unknown/Multiple
   Architecture:                   |   Type of failure:  Compile-time crash
  Unknown/Multiple                 |         Test Case:
     Difficulty:  Unknown          |          Blocking:
     Blocked By:                   |
Related Tickets:                   |
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 The limit on spill slots was removed for the linear register allocator in
 7.8, but not for `-fregs-graph`.

 SHA-1 fails to compile with `-fregs-graph` in 7.8.

 Related: #7679 (`-fregs-graph` generates poor code with the new codegen).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8657>
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