[GHC] #14227: Add -fdefer-ffi-errors flag

[GHC]

#14227: Add -fdefer-ffi-errors flag
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        Reporter:  tysonzero         |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 Would be fine with me.

 It's a user-facing change, so worth running quickly through the
 [https://github.com/ghc-proposals/ghc-proposals GHC proposals process].
 Should be fast!

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14227#comment:2>
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