Merge pull request #21841 from linux-on-ibm-z/swift5.0-s390x-tupleSize-fix

Fix test case regressions on s390x arch

Author: jckarter

include/swift/Remote/MetadataReader.h

@@ -1113,7 +1113,7 @@ class MetadataReader {
       case MetadataKind::Tuple: {
         auto numElementsAddress = address +
           TargetTupleTypeMetadata<Runtime>::getOffsetToNumElements();
-        uint32_t numElements;
+        StoredSize numElements;
         if (!Reader->readInteger(RemoteAddress(numElementsAddress),
                                  &numElements))
           return nullptr;