[nfc] remove unnecessary overload

Author: kavon

include/swift/SIL/SILType.h

@@ -862,10 +862,6 @@ class SILType {
     return getSILBoxFieldType(fn).isMoveOnly();
   }
 
-  bool isBoxedNonCopyableType(const SILFunction &fn) const {
-    return isBoxedNonCopyableType(&fn);
-  }
-
   bool isBoxedMoveOnlyWrappedType(const SILFunction *fn) const {
     if (!this->is<SILBoxType>())
       return false;

lib/SILOptimizer/Transforms/AllocBoxToStack.cpp

@@ -1062,7 +1062,7 @@ specializeApplySite(SILOptFunctionBuilder &FuncBuilder, ApplySite Apply,
     // boxes, convert them from having escaping to having non-escaping
     // semantics.
     for (unsigned index : PromotedCalleeArgIndices) {
-      if (F->getArgument(index)->getType().isBoxedNonCopyableType(*F)) {
+      if (F->getArgument(index)->getType().isBoxedNonCopyableType(F)) {
         auto boxType = F->getArgument(index)->getType().castTo<SILBoxType>();
         bool isMutable = boxType->getLayout()->getFields()[0].isMutable();
         auto checkKind = isMutable ? MarkUnresolvedNonCopyableValueInst::