Remove _swift_allocBox_ function pointers.

Author: troughton

include/swift/Runtime/InstrumentsSupport.h

@@ -25,8 +25,6 @@ SWIFT_RUNTIME_EXPORT
 HeapObject *(*_swift_allocObject)(HeapMetadata const *metadata,
                                   size_t requiredSize,
                                   size_t requiredAlignmentMask);
-SWIFT_CC(swift) SWIFT_RUNTIME_EXPORT
-BoxPair (*_swift_allocBox)(Metadata const *type);
 SWIFT_RUNTIME_EXPORT
 HeapObject *(*_swift_retain)(HeapObject *object);
 SWIFT_RUNTIME_EXPORT

stdlib/public/runtime/HeapObject.cpp

@@ -236,11 +236,6 @@ BoxPair swift::swift_makeBoxUnique(OpaqueValue *buffer, const Metadata *type,
 }
 
 BoxPair swift::swift_allocBox(const Metadata *type) {
-  return _swift_allocBox(type);
-}
-
-SWIFT_CC(swift)
-static BoxPair _swift_allocBox_(const Metadata *type) {
   // Get the heap metadata for the box.
   auto metadata = &Boxes.getOrInsert(type).first->Data;
 
@@ -252,8 +247,6 @@ static BoxPair _swift_allocBox_(const Metadata *type) {
   return BoxPair{allocation, projection};
 }
 
-auto swift::_swift_allocBox = _swift_allocBox_;
-
 void swift::swift_deallocBox(HeapObject *o) {
   auto metadata = static_cast<const GenericBoxHeapMetadata *>(o->metadata);
   // Move the object to the deallocating state (+1 -> +0).