SILGen: ban getSILArgumentConvention

This function will give the wrong convention in SILGen when
using -enable-sil-opaque-values. In particular, it will say
arguments are indirect when they are not.

lib/SIL/Utils/MemAccessUtils.cpp

@@ -22,6 +22,7 @@
 #include "swift/SIL/SILBridging.h"
 #include "swift/SIL/SILInstruction.h"
 #include "swift/SIL/SILModule.h"
+#include "swift/SIL/SILGenUtils.h"
 #include "swift/SIL/SILUndef.h"
 #include "swift/SIL/Test.h"
 #include "llvm/Support/Debug.h"
@@ -2485,6 +2486,12 @@ void swift::checkSwitchEnumBlockArg(SILPhiArgument *arg) {
   }
 }
 
+bool swift::isPossibleUnsafeAccessInvalidStorage(SILValue address,
+                                                 SILFunction *F) {
+  auto storage = AccessStorage::compute(address);
+  return storage && !isPossibleFormalAccessStorage(storage, F);
+}
+
 bool swift::isPossibleFormalAccessStorage(const AccessStorage &storage,
                                           SILFunction *F) {
   switch (storage.getKind()) {