Merge pull request #1462 from hvitved/csharp/controlflowgraph-depr

C#: Remove uses of deprecated `ControlFlowGraph` module

csharp/ql/src/semmle/code/csharp/controlflow/ControlFlowElement.qll

@@ -37,14 +37,14 @@ class ControlFlowElement extends ExprOrStmtParent, @control_flow_element {
    * Gets a first control flow node executed within this element.
    */
   Node getAControlFlowEntryNode() {
-    result = ControlFlowGraph::Internal::getAControlFlowEntryNode(this).getAControlFlowNode()
+    result = Internal::getAControlFlowEntryNode(this).getAControlFlowNode()
   }
 
   /**
    * Gets a potential last control flow node executed within this element.
    */
   Node getAControlFlowExitNode() {
-    result = ControlFlowGraph::Internal::getAControlFlowExitNode(this).getAControlFlowNode()
+    result = Internal::getAControlFlowExitNode(this).getAControlFlowNode()
   }
 
   /**

csharp/ql/test/library-tests/csharp8/NullCoalescingControlFlow.ql

@@ -1,5 +1,4 @@
 import csharp
-import semmle.code.csharp.controlflow.ControlFlowGraph
 
 query predicate edges(ControlFlow::Node node1, ControlFlow::Node node2, string label, string value) {
   label = "semmle.label" and

csharp/ql/test/library-tests/csharp8/UsingControlFlow.ql

@@ -1,5 +1,4 @@
 import csharp
-import semmle.code.csharp.controlflow.ControlFlowGraph
 
 query predicate edges(ControlFlow::Node node1, ControlFlow::Node node2, string label, string value) {
   label = "semmle.label" and

csharp/ql/test/library-tests/standalone/controlflow/cfg.ql

@@ -1,5 +1,4 @@
 import csharp
-import semmle.code.csharp.controlflow.ControlFlowGraph
 
 /**
  * A method call where the target is unknown.