Enable CSE on OSSA

Author: meg-gupta

include/swift/SILOptimizer/Utils/OwnershipOptUtils.h

@@ -42,7 +42,7 @@ struct OwnershipFixupContext {
   /// Namely, we do not support RAUWing values with ValueOwnershipKind::None
   /// that have uses that do not require ValueOwnershipKind::None or
   /// ValueOwnershipKind::Any.
-  static bool canFixUpOwnershipForRAUW(SingleValueInstruction *oldValue,
+  static bool canFixUpOwnershipForRAUW(const SingleValueInstruction *oldValue,
                                        SILValue newValue);
 };
 

lib/SIL/IR/SILInstruction.cpp

@@ -372,6 +372,14 @@ namespace {
       return true;
     }
 
+    bool visitDestructureStructInst(const DestructureStructInst *RHS) {
+      return true;
+    }
+
+    bool visitDestructureTupleInst(const DestructureTupleInst *RHS) {
+      return true;
+    }
+
     bool visitAllocRefInst(const AllocRefInst *RHS) {
       auto *LHSInst = cast<AllocRefInst>(LHS);
       auto LHSTypes = LHSInst->getTailAllocatedTypes();