Merge pull request #7432 from dotnet/backport/pr-7430-to-release/9.0.1xx

[release/9.0.1xx] Update field references

Author: jaredpar

src/Utilities/FlowAnalysis/FlowAnalysis/Framework/DataFlow/AnalysisEntity.cs

@@ -186,8 +186,8 @@ internal bool ShouldBeTrackedForAnalysis(bool hasCompletePointsToAnalysisResult)
 
         public bool HasConstantValue => Symbol switch
         {
-            IFieldSymbol field => field.HasConstantValue,
-            ILocalSymbol local => local.HasConstantValue,
+            IFieldSymbol fieldSymbol => fieldSymbol.HasConstantValue,
+            ILocalSymbol localSymbol => localSymbol.HasConstantValue,
             _ => false,
         };