[GHC] #14909: Change default armhf target to a newer architecture

[GHC]

#14909: Change default armhf target to a newer architecture
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        Reporter:  Phyx-               |                Owner:  (none)
            Type:  task                |               Status:  new
        Priority:  normal              |            Milestone:
       Component:  Compiler (CodeGen)  |              Version:  8.5
      Resolution:                      |             Keywords:
Operating System:  Unknown/Multiple    |         Architecture:  arm
 Type of failure:  None/Unknown        |            Test Case:
      Blocked By:                      |             Blocking:
 Related Tickets:                      |  Differential Rev(s):
       Wiki Page:                      |
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Comment (by Phyx-):

 `generic` may work as well, as long as `llvm` doesn't generate the
 deprecated instructions then. Ideally, we should take the `-mcpu` option
 at configure time. And GHC should take it when calling llvm.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14909#comment:1>
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