Avoid allocating in IsOperatorName (#7061)
Avoid allocating in IsOperatorName (#7061)

* Avoid allocating in IsOperatorName

* bring back Ordinal

* flip bool

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