[GHC] #15168: GHC HEAD crashes on Windows 64 after the SRT overhaul (May 16, 2018 and newer)

[GHC]

#15168: GHC HEAD crashes on Windows 64 after the SRT overhaul (May 16, 2018 and
newer)
-------------------------------------+-------------------------------------
           Reporter:  awson          |             Owner:  (none)
               Type:  bug            |            Status:  new
           Priority:  high           |         Milestone:  8.6.1
          Component:  Compiler       |           Version:  8.5
           Keywords:                 |  Operating System:  Windows
       Architecture:  x86_64         |   Type of failure:  Compile-time
  (amd64)                            |  crash or panic
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
-------------------------------------+-------------------------------------
 After the series of SRT overhaul patches GHC doesn't work on Windows
 64-bit.

 GHC executable crashes (AV) on any attempt to compile anything or even to
 start in interactive mode. When crashed it report crash address which may
 look not as a real address at all (e.g. 0x800 or 0xffffffffffffffff) and
 may report either reading from or executing such an address.

 OTOH, when started with, e.g. `+RTS -A256m -RTS` it is able to compile
 some programs (`haddock` at least).

 Reverting all related commits down to
 eb8e692cab7970c495681e14721d05ecadd21581 make things work again.

 I have no proof that things went bad exactly at
 eb8e692cab7970c495681e14721d05ecadd21581. Perhaps, this happened later on,
 but I have a proof that things were good immediately before.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15168>
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