Remove LocalStorageType, make it a kind of SILType.

Swift SVN r6968

lib/Serialization/ModuleFile.cpp

@@ -1671,14 +1671,6 @@ Type ModuleFile::getType(TypeID TID) {
     break;
   }
 
-  case decls_block::LOCAL_STORAGE_TYPE: {
-    TypeID valueTypeID;
-    decls_block::LocalStorageTypeLayout::readRecord(scratch, valueTypeID);
-
-    typeOrOffset = LocalStorageType::get(getType(valueTypeID), ctx);
-    break;
-  }
-
   case decls_block::REFERENCE_STORAGE_TYPE: {
     uint8_t rawOwnership;
     TypeID referentTypeID;