Swift: Share 'ControlFlowGraphImplShared.qll' for Swift with Ruby and C#.

Author: MathiasVP

config/identical-files.json

@@ -500,7 +500,8 @@
   ],
   "CFG": [
     "csharp/ql/lib/semmle/code/csharp/controlflow/internal/ControlFlowGraphImplShared.qll",
-    "ruby/ql/lib/codeql/ruby/controlflow/internal/ControlFlowGraphImplShared.qll"
+    "ruby/ql/lib/codeql/ruby/controlflow/internal/ControlFlowGraphImplShared.qll",
+    "swift/ql/lib/codeql/swift/controlflow/internal/ControlFlowGraphImplShared.qll"
   ],
   "TypeTracker": [
     "python/ql/lib/semmle/python/dataflow/new/internal/TypeTracker.qll",