GHC HEAD crashes on Windows 64 after the SRT overhaul (May 16, 2018 and newer)

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 eb8e692c make things work again.

I have no proof that things went bad exactly at eb8e692c. Perhaps, this happened later on, but I have a proof that things were good immediately before.

Trac metadata

Trac field	Value
Version	8.5
Type	Bug
TypeOfFailure	OtherFailure
Priority	high
Resolution	Unresolved
Component	Compiler
Test case
Differential revisions
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Blocking
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Operating system
Architecture