Remove redundant helper.

src/Analyzers/Core/CodeFixes/PopulateSwitch/AbstractPopulateSwitchCodeFixProvider.cs

@@ -145,7 +145,7 @@ public sealed override Task RegisterCodeFixesAsync(CodeFixContext context)
             if (switchNode == null)
                 return;
 
-            var model = await document.RequireSemanticModelAsync(cancellationToken).ConfigureAwait(false);
+            var model = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
             // https://github.com/dotnet/roslyn/issues/40505
             var switchStatement = (TSwitchOperation)model.GetOperation(switchNode, cancellationToken)!;
 

src/Analyzers/Core/CodeFixes/SimplifyInterpolation/AbstractSimplifyInterpolationCodeFixProvider.cs

@@ -54,7 +54,7 @@ public override Task RegisterCodeFixesAsync(CodeFixContext context)
             Document document, ImmutableArray<Diagnostic> diagnostics,
             SyntaxEditor editor, CancellationToken cancellationToken)
         {
-            var semanticModel = await document.RequireSemanticModelAsync(cancellationToken).ConfigureAwait(false);
+            var semanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
             var generator = editor.Generator;
             var generatorInternal = document.GetRequiredLanguageService<SyntaxGeneratorInternal>();
             foreach (var diagnostic in diagnostics)

src/Analyzers/Core/CodeFixes/UseSystemHashCode/UseSystemHashCodeCodeFixProvider.cs

@@ -58,7 +58,7 @@ public override Task RegisterCodeFixesAsync(CodeFixContext context)
                 return;
             }
 
-            var semanticModel = await document.RequireSemanticModelAsync(cancellationToken).ConfigureAwait(false);
+            var semanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
             if (!Analyzer.TryGetAnalyzer(semanticModel.Compilation, out var analyzer))
             {
                 Debug.Fail("Could not get analyzer");

src/Features/CSharp/Portable/ReverseForStatement/CSharpReverseForStatementCodeRefactoringProvider.cs

@@ -67,7 +67,7 @@ public override async Task ComputeRefactoringsAsync(CodeRefactoringContext conte
             if (MatchesIncrementPattern(variable, condition, after, out var start, out var equals, out var end) ||
                 MatchesDecrementPattern(variable, condition, after, out end, out start))
             {
-                var semanticModel = await document.RequireSemanticModelAsync(cancellationToken).ConfigureAwait(false);
+                var semanticModel = await document.GetRequiredSemanticModelAsync(cancellationToken).ConfigureAwait(false);
                 if (IsUnsignedBoundary(semanticModel, variable, start, end, cancellationToken))
                 {
                     // Don't allow reversing when you have unsigned types and are on the start/end

src/Workspaces/SharedUtilitiesAndExtensions/Workspace/Core/Extensions/DocumentExtensions.cs

@@ -184,12 +184,6 @@ public static async Task<bool> IsGeneratedCodeAsync(this Document document, Canc
                 await generatedCodeRecognitionService.IsGeneratedCodeAsync(document, cancellationToken).ConfigureAwait(false);
         }
 
-        public static async Task<SemanticModel> RequireSemanticModelAsync(this Document document, CancellationToken cancellationToken)
-        {
-            var model = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
-            return model ?? throw new InvalidOperationException();
-        }
-
         public static IEnumerable<Document> GetLinkedDocuments(this Document document)
         {
             var solution = document.Project.Solution;