Merge pull request #40984 from sharwell/fix-assertion

Fix assertion for the bootstrap compiler

src/Compilers/CSharp/Portable/Symbols/PublicModel/ArrayTypeSymbol.cs

@@ -6,6 +6,7 @@
 using System.Diagnostics;
 using System.Diagnostics.CodeAnalysis;
 using System.Threading;
+using Roslyn.Utilities;
 
 namespace Microsoft.CodeAnalysis.CSharp.Symbols.PublicModel
 {
@@ -17,7 +18,7 @@ internal sealed class ArrayTypeSymbol : TypeSymbol, IArrayTypeSymbol
         public ArrayTypeSymbol(Symbols.ArrayTypeSymbol underlying, CodeAnalysis.NullableAnnotation nullableAnnotation)
             : base(nullableAnnotation)
         {
-            Debug.Assert(underlying is object);
+            RoslynDebug.Assert(underlying is object);
             _underlying = underlying;
         }