[GHC] #10953: Switch to LLVM 3.7

[GHC]

#10953: Switch to LLVM 3.7
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           Reporter:  erikd          |             Owner:  erikd
               Type:  bug            |            Status:  new
           Priority:  normal         |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.11
  (LLVM)                             |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |
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 LLVM 3.6 is broken on AArch64/Arm64 and LLVM 3.7 was released in August.

 I already have git master building with LLVM-3.7 on x86_64/linux and can
 test on numerous others.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10953>
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