C#: Remove the callableFlow for the Add method in subtypes of System.Collections.IEnumerable.

Author: michaelnebel

csharp/ql/lib/semmle/code/csharp/dataflow/LibraryTypeDataFlow.qll

@@ -478,25 +478,6 @@ class SystemTextStringBuilderFlow extends LibraryTypeDataFlow, SystemTextStringB
 class IEnumerableFlow extends LibraryTypeDataFlow, RefType {
   IEnumerableFlow() { this.getABaseType*() instanceof SystemCollectionsIEnumerableInterface }
 
-  override predicate callableFlow(
-    CallableFlowSource source, AccessPath sourceAp, CallableFlowSink sink, AccessPath sinkAp,
-    SourceDeclarationCallable c, boolean preservesValue
-  ) {
-    preservesValue = true and
-    exists(string name, int arity |
-      arity = c.getNumberOfParameters() and
-      c = this.getAMethod() and
-      c.getUndecoratedName() = name
-    |
-      name = "Add" and
-      arity = 1 and
-      source = TCallableFlowSourceArg(0) and
-      sourceAp = AccessPath::empty() and
-      sink instanceof CallableFlowSinkQualifier and
-      sinkAp = AccessPath::element()
-    )
-  }
-
   override predicate clearsContent(
     CallableFlowSource source, Content content, SourceDeclarationCallable callable
   ) {