[GHC] #11981: unknown symbol `__udivti3' when BuildFlavour = perf-llvm

[GHC]

#11981: unknown symbol `__udivti3' when BuildFlavour = perf-llvm
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Phyx-):

 @erikd you could probably just add it to `extra-libraries` in `libraries
 \ghc-prim\ghc-prim.cabal`. This would pass it on when linking against
 `ghc-prim` both interpreted and compiled.

 However this won't work on Windows because on Windows `gcc_s` is an import
 library with a non-standard name (.a instead of .dll.a), and we can't
 identify these properly yet.

 So I think your fix of adding them to `RtsSymbols.c` is good enough for
 now.

 I created #12486 for a way to not need to re-export these symbols from the
 RTS.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11981#comment:8>
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