Simplify

src/Features/CSharp/Portable/UseIndexOrRangeOperator/CSharpUseIndexOperatorDiagnosticAnalyzer.InfoCache.cs

@@ -46,7 +46,7 @@ public InfoCache(Compilation compilation)
                         compilation.GetSpecialType(SpecialType.System_Int32),
                         compilation.GetSpecialType(SpecialType.System_Char));
 
-                    _methodToMemberInfo[indexer.GetMethod] = ComputeMemberInfo(indexer.GetMethod, requireIndexMember: false);
+                    _methodToMemberInfo[indexer.GetMethod] = ComputeMemberInfo(indexer.GetMethod);
                 }
             }
 
@@ -56,13 +56,13 @@ public bool TryGetMemberInfo(IMethodSymbol methodSymbol, out MemberInfo memberIn
 
                 if (IsIntIndexingMethod(methodSymbol))
                 {
-                    memberInfo = _methodToMemberInfo.GetOrAdd(methodSymbol, m => ComputeMemberInfo(m, requireIndexMember: true));
+                    memberInfo = _methodToMemberInfo.GetOrAdd(methodSymbol, m => ComputeMemberInfo(m));
                 }
 
                 return memberInfo.LengthLikeProperty != null;
             }
 
-            private MemberInfo ComputeMemberInfo(IMethodSymbol method, bool requireIndexMember)
+            private MemberInfo ComputeMemberInfo(IMethodSymbol method)
             {
                 Debug.Assert(IsIntIndexingMethod(method));
 
@@ -75,11 +75,6 @@ private MemberInfo ComputeMemberInfo(IMethodSymbol method, bool requireIndexMemb
                     return default;
                 }
 
-                if (!requireIndexMember)
-                {
-                    return new MemberInfo(lengthLikeProperty, overloadedMethodOpt: null);
-                }
-
                 if (method.MethodKind == MethodKind.PropertyGet)
                 {
                     // this is the getter for an indexer.  i.e. the user is calling something