Merge pull request #21473 from aschackmull/csharp/dataflow-no-split

C#: Remove splitting-awareness from data flow.

Author: aschackmull

config/identical-files.json

@@ -172,10 +172,6 @@
     "cpp/ql/lib/semmle/code/cpp/ir/implementation/raw/internal/reachability/PrintDominance.qll",
     "cpp/ql/lib/semmle/code/cpp/ir/implementation/unaliased_ssa/internal/reachability/PrintDominance.qll"
   ],
-  "C# ControlFlowReachability": [
-    "csharp/ql/lib/semmle/code/csharp/dataflow/internal/ControlFlowReachability.qll",
-    "csharp/ql/lib/semmle/code/csharp/dataflow/internal/rangeanalysis/ControlFlowReachability.qll"
-  ],
   "C++ ExternalAPIs": [
     "cpp/ql/src/Security/CWE/CWE-020/ExternalAPIs.qll",
     "cpp/ql/src/Security/CWE/CWE-020/ir/ExternalAPIs.qll"

csharp/ql/consistency-queries/DataFlowConsistency.ql

@@ -35,9 +35,7 @@ private module Input implements InputSig<Location, CsharpDataFlow> {
     or
     n.asExpr().(ObjectCreation).hasInitializer()
     or
-    exists(
-      n.(PostUpdateNode).getPreUpdateNode().asExprAtNode(LocalFlow::getPostUpdateReverseStep(_))
-    )
+    n.(PostUpdateNode).getPreUpdateNode().asExpr() = LocalFlow::getPostUpdateReverseStep(_)
   }
 
   predicate argHasPostUpdateExclude(ArgumentNode n) {