optimize GetEnvironmentLookupResolutionsAtPosition (#2580)
optimize GetEnvironmentLookupResolutionsAtPosition (#2580)


syeerzy/visualfsharp,cloudRoutine/FSharp.Compiler.Service,dsyme/FSharp.Compiler.Service,0x53A/FSharp.Compiler.Service,dsyme/fsharp,syeerzy/visualfsharp,dsyme/fsharp,brettfo/visualfsharp,0x53A/FSharp.Compiler.Service,ncave/FSharp.Compiler.Service,sergey-tihon/FSharp.Compiler.Service,dsyme/fsharp,cloudRoutine/FSharp.Compiler.Service,alfonsogarciacaro/FSharp.Compiler.Service,ncave/FSharp.Compiler.Service,dsyme/fsharp,fsharp/fsharp,Jand42/FSharp.Compiler.Service,forki/FSharp.Compiler.Service,brettfo/visualfsharp,dsyme/fsharp,syeerzy/visualfsharp,fsharp/fsharp,dsyme/FSharp.Compiler.Service,brettfo/visualfsharp,0x53A/FSharp.Compiler.Service,forki/FSharp.Compiler.Service,sergey-tihon/FSharp.Compiler.Service,Jand42/FSharp.Compiler.Service,syeerzy/visualfsharp,dsyme/fsharp,sergey-tihon/FSharp.Compiler.Service,alfonsogarciacaro/FSharp.Compiler.Service,cloudRoutine/FSharp.Compiler.Service,brettfo/visualfsharp,syeerzy/visualfsharp,brettfo/visualfsharp,syeerzy/visualfsharp,alfonsogarciacaro/FSharp.Compiler.Service,brettfo/visualfsharp,ncave/FSharp.Compiler.Service,Jand42/FSharp.Compiler.Service,forki/FSharp.Compiler.Service,dsyme/fsharp,fsharp/fsharp,dsyme/FSharp.Compiler.Service