[GHC] #3122: Enhance --info

[GHC]

#3122: Enhance --info
-------------------------------+--------------------------------------------
  Reporter:  igloo             |          Owner:  igloo           
      Type:  feature request   |         Status:  new             
  Priority:  normal            |      Milestone:  6.12 branch     
 Component:  Compiler          |        Version:  6.10.1          
  Severity:  normal            |       Keywords:                  
Difficulty:  Unknown           |       Testcase:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
-------------------------------+--------------------------------------------
 We should:
  * Add things like C compiler, assembler, linker, libdir into the `--info`
 output
  * Generalise `--print-libdir` such that `--print-foo` prints the foo
 field from the `--info` output.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3122>
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