[NFC] [ShrinkBorrowScope] Used standard assert.

Author: nate-chandler

lib/SILOptimizer/Utils/ShrinkBorrowScope.cpp

@@ -301,13 +301,9 @@ void ShrinkBorrowScope::findBarriers() {
       // At that time, it was checked that this block (along with all that
       // successor's other predecessors) had a terminator over which the borrow
       // scope could be shrunk.  Shrink it now.
-#ifndef NDEBUG
-      bool hoisted = 
-#endif
-      tryHoistOverInstruction(block->getTerminator());
-#ifndef NDEBUG
+      bool hoisted = tryHoistOverInstruction(block->getTerminator());
       assert(hoisted);
-#endif
+      (void)hoisted;
     }
     SILInstruction *barrier = nullptr;
     while ((instruction = instruction->getPreviousInstruction())) {