[GHC] #10170: Find versioned versions of LLVM tools

[GHC]

#10170: Find versioned versions of LLVM tools
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        Reporter:  erikd             |                   Owner:  erikd
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (LLVM)   |                 Version:  7.11
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by erikd):

 @rwbarton Yes, it should look for a versioned `/usr/lib/llc-X.Y` but also
 accept `/usr/lib/llvm-3.6/bin/llc`. More importantly configure should fail
 if whatever version of `llc` it finds isn't the currently blessed version.

 @thomie Unfortunately, I think that `FIND_LLVM` macro will need to grow,
 not disappear.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10170#comment:5>
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