Summary:
This patch is courtesy of @awson.

Currently, whenever GHC catches a segfault on Windows, it simply reports the
somewhat uninformative message
`Segmentation fault/access violation in generated code`. This patch adds to
the message the type of violation (read/write/dep) and location information,
which should help debugging segfaults in the future.

Fixes #13108.

Test Plan: Build on Windows

Reviewers: austin, erikd, bgamari, simonmar, Phyx

Reviewed By: bgamari, Phyx

Subscribers: awson, thomie, #ghc_windows_task_force

Differential Revision: https://phabricator.haskell.org/D2969

GHC Trac Issues: #13108