Disable checked_cast_br jump threading in ossa temporarily

This was enabled in ossa recently.
There are 2 bugs:
- In CheckedCastBrJumpThreading::Edit::canRAUW, we don't check for canFixUpOwnershipForRAUW.
- Currently modifyCFGForSuccessPreds has to be called after modifyCFGForFailurePreds.
But modifyCFGForFailurePreds can modify cfg in a way such that OSSA RAUW can no longer be done in modifyCFGForSuccessPreds.

This will require an algorithmic change, disabling temporarily to unblock rdar://121484645

Author: meg-gupta

lib/SILOptimizer/Utils/CheckedCastBrJumpThreading.cpp

@@ -804,6 +804,11 @@ bool tryCheckedCastBrJumpThreading(
     SmallVectorImpl<SILBasicBlock *> &BlocksForWorklist,
     bool EnableOSSARewriteTerminator) {
 
+  // TODO: Disable for OSSA temporarily
+  if (Fn->hasOwnership()) {
+    return false;
+  }
+
   CheckedCastBrJumpThreading CCBJumpThreading(Fn, DT, deBlocks,
                                               BlocksForWorklist,
                                               EnableOSSARewriteTerminator);