no need to box array when we check for null (#6503)
no need to box array when we check for null (#6503)


brettfo/visualfsharp,dsyme/fsharp,dsyme/fsharp,brettfo/visualfsharp,brettfo/visualfsharp,cloudRoutine/FSharp.Compiler.Service,dsyme/fsharp,dsyme/fsharp,brettfo/visualfsharp,dsyme/fsharp,brettfo/visualfsharp,dsyme/fsharp,dsyme/fsharp,cloudRoutine/FSharp.Compiler.Service,cloudRoutine/FSharp.Compiler.Service,brettfo/visualfsharp