[GHC] #16111: Inconsistent behavior of Data.Bits.shiftL with different optimization levels and -fllvm

[GHC]

#16111: Inconsistent behavior of Data.Bits.shiftL with different optimization
levels and -fllvm
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 I've attached the `-ddump-simpl` output for each combination. (For
 instance, `Bug.dump-simpl-O0-nollvm` is for the `-O0` variant, and `Bug
 .dump-simpl-O0-llvm` is for the `-O0 -llvm` variant.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16111#comment:2>
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