[BOLT] Fix SCTC again again.

Summary: I put the const_cast<BinaryFunction *>(this) on the wrong version of getBasicBlockAfter().  It's on the right one now.

(cherry picked from FBD5159127)

bolt/BinaryFunction.h

@@ -967,6 +967,12 @@ class BinaryFunction {
   /// nullptr the last basic block is given.
   const BinaryBasicBlock *getBasicBlockAfter(const BinaryBasicBlock *BB,
                                              bool IgnoreSplits = true) const {
+    return
+      const_cast<BinaryFunction *>(this)->getBasicBlockAfter(BB, IgnoreSplits);
+  }
+
+  BinaryBasicBlock *getBasicBlockAfter(const BinaryBasicBlock *BB,
+                                       bool IgnoreSplits = true) {
     for (auto I = layout_begin(), E = layout_end(); I != E; ++I) {
       auto Next = std::next(I);
       if (*I == BB && Next != E) {
@@ -977,12 +983,6 @@ class BinaryFunction {
     return nullptr;
   }
 
-  BinaryBasicBlock *getBasicBlockAfter(const BinaryBasicBlock *BB,
-                                       bool IgnoreSplits = true) {
-    return
-      const_cast<BinaryFunction *>(this)->getBasicBlockAfter(BB, IgnoreSplits);
-  }
-
   /// Retrieve the landing pad BB associated with invoke instruction \p Invoke
   /// that is in \p BB. Return nullptr if none exists
   BinaryBasicBlock *getLandingPadBBFor(const BinaryBasicBlock &BB,