COWArrayOpts: remove the -view-cfg-before-cow-for option for debugging

This option is very old. The same effect can now be achieved with pass-manager options, like -sil-print-before

lib/SILOptimizer/LoopTransforms/COWArrayOpt.cpp

@@ -38,12 +38,6 @@
 #include "llvm/Support/Debug.h"
 using namespace swift;
 
-#ifndef NDEBUG
-llvm::cl::opt<std::string>
-COWViewCFGFunction("view-cfg-before-cow-for", llvm::cl::init(""),
-                   llvm::cl::desc("Only print out the sil for this function"));
-#endif
-
 /// \return a sequence of integers representing the access path of this element
 /// within a Struct/Ref/Tuple.
 ///
@@ -1585,13 +1579,6 @@ class COWArrayOptPass : public SILFunctionTransform {
       return;
     }
 
-#ifndef NDEBUG
-    if (!COWViewCFGFunction.empty() && getFunction()->getName() == COWViewCFGFunction) {
-      getFunction()->dump();
-      getFunction()->viewCFG();
-    }
-#endif
-
     // Create a flat list of loops in loop-tree postorder (bottom-up).
     llvm::SmallVector<SILLoop *, 16> Loops;
     std::function<void (SILLoop*)> pushChildren = [&](SILLoop *L) {