fsi incorrect handling of some script arguments

[g874200]

Consider script test_args.fsx:

printfn "%A" fsi.CommandLineArgs

When execing:

>dotnet fsi test_args.fsx -r -f
[|"test_args.fsx"; "-r:-f"|]

When using:

>dotnet fsi --use:test_args.fsx -- -- -r -f

Microsoft (R) F# Interactive version 14.0.101.0 for F# 10.0
Copyright (c) Microsoft Corporation. All Rights Reserved.

For help type #help;;

> [|"test_args.fsx"; "-r:-f"|]
val it: unit = ()

From looking over fsi.fs, it seems that PostProcessCompilerArgs is called before any other command line processing. This will find the '-r' and treat it as an abbreviated --reference option, combining it with its "argument" into a single -r:-f. Perhaps, rather than the initial PostProcessCompilerArgs, the check for a space-separated arg for -r (for example) could be added to the main loop in ParseCompilerOptions.