Cross-compiling bug in the LLVM backend driver

The LLVM backend driver currently assumes that we are targeting the same 
architecture as LLVM is defaultly set to target.  The hack solution is:

diff --git a/compiler/main/DriverPipeline.hs
b/compiler/main/DriverPipeline.hs
index fd5694f..80a7b99 100644
--- a/compiler/main/DriverPipeline.hs
+++ b/compiler/main/DriverPipeline.hs
@@ -1331,9 +1331,9 @@ runPhase LlvmOpt input_fn dflags
  output_fn <- phaseOutputFilename LlvmLlc

  io $ SysTools.runLlvmOpt dflags
  ([ SysTools.FileOption "" input_fn,
  SysTools.Option "-o",
- SysTools.FileOption "" output_fn
+ SysTools.FileOption "" output_fn, SysTools.Option "-mtriple=arm-unknown-nto-qnx8.0.0eabi"]
  ++ optFlag
  ++ [SysTools.Option tbaa]
  ++ map SysTools.Option lo_opts)

And this is exactly the tripl as passed to / detected by GHC's `./configure` 
script, so to my mind the nicest solution would be to preserve that target 
triple from `./configure` and always pass it through to LLVM.

Thoughts?

-- 
Stephen Paul Weber, @singpolyma
See <http://singpolyma.net> for how I prefer to be contacted
edition right joseph

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