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It's often hard to debug things like segfaults on Windows, mostly because gdb isn't always of use and users don't know how to effectively use it. This patch provides a way to create a crash drump by passing `+RTS --generate-crash-dumps` as an option. If any unhandled exception is triggered a dump is made that contains enough information to be able to diagnose things successfully. Currently the created dumps are a bit big because I include all registers, code and threads information. This looks like ``` $ testsuite/tests/rts/derefnull.run/derefnull.exe +RTS --generate-crash-dumps Access violation in generated code when reading 0000000000000000 Crash dump created. Dump written to: E:\msys64\tmp\ghc-20170901-220250-11216-16628.dmp ``` Test Plan: ./validate Reviewers: austin, hvr, bgamari, erikd, simonmar Reviewed By: bgamari, simonmar Subscribers: rwbarton, thomie Differential Revision: https://phabricator.haskell.org/D3912
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