[GHC] #8321: improve basic block layout on LLVM backend by predicting stack/heap checks

[GHC]

#8321: improve basic block layout on LLVM backend by predicting stack/heap checks
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        Reporter:  rwbarton          |            Owner:  rwbarton
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:  7.10.1
       Component:  Compiler (LLVM)   |          Version:  7.7
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by carter):

 Awesome work Reid!

 this sort of perf boost is huge.
 (also is another bullet point for why a lot of 7.10 work should be giving
 the code gens some love.)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8321#comment:2>
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