src/Compiler/TypedTree/TypedTreePickle.fs and refactored. (#18203)

Author: progressive-galib

docs/release-notes/.FSharp.Compiler.Service/9.0.200.md

@@ -52,6 +52,7 @@
 * Better ranges for #nowarn error reporting; bring back #nowarn warnings for --langVersion:80; add warnings under feature flag ([PR #17871](https://github.com/dotnet/fsharp/pull/17871))
 * CheckAndThrow can be invoked only from within Cancellable context ([PR #18037](https://github.com/dotnet/fsharp/pull/18037))
 * Make ILTypeDef base type calculation lazy. ([PR #18005](https://github.com/dotnet/fsharp/pull/18005))
+* "#if" directive around nullness removed from src/Compiler/TypedTree/TypedTreePickle.fs and refactored. ([PR #18203](https://github.com/dotnet/fsharp/pull/18203))
 
 ### Breaking Changes
 

src/Compiler/TypedTree/TypedTreePickle.fs

@@ -67,11 +67,7 @@ type PickledDataWithReferences<'rawData> =
 //---------------------------------------------------------------------------
 
 [<NoEquality; NoComparison>]
-#if NO_CHECKNULLS
-type Table<'T> =
-#else
 type Table<'T when 'T: not null> =
-#endif
     { name: string
       tbl: Dictionary<'T, int>
       mutable rows: ResizeArray<'T>