Occasionally when submitting PRs we get the error described here: #6415 (comment)

The FSC compiler from the .NET SDK using the bootstrap is hitting a bug on Linux and macOS as of commit #97d7a02:

    13>FSC : error FS2014: A problem occurred writing the binary '/Users/vsts/agent/2.149.2/work/1/s/fcs/../artifacts/obj/fcs/net461/FSharp.Compiler.Service.dll': EmitZUntaggedIndex: too big for small address or simple index [/Users/vsts/agent/2.149.2/work/1/s/fcs/FSharp.Compiler.Service/FSharp.Compiler.Service.fsproj]

This bug has cropped up now and then. The current compiler code has some extra instrumentation for this error to help us diagnose it, but compiling using the exact commit above might help us understand it too