Index: include/lldb/Expression/IRMemoryMap.h
===================================================================
--- include/lldb/Expression/IRMemoryMap.h
+++ include/lldb/Expression/IRMemoryMap.h
@@ -60,6 +60,7 @@
     void Free (lldb::addr_t process_address, Error &error);
     
     void WriteMemory (lldb::addr_t process_address, const uint8_t *bytes, size_t size, Error &error);
+    void WriteMemory (lldb::addr_t process_address, const uint8_t *bytes, size_t size, lldb::ByteOrder order, Error &error);
     void WriteScalarToMemory (lldb::addr_t process_address, Scalar &scalar, size_t size, Error &error);
     void WritePointerToMemory (lldb::addr_t process_address, lldb::addr_t address, Error &error);
     void ReadMemory (uint8_t *bytes, lldb::addr_t process_address, size_t size, Error &error);
Index: source/Expression/IRMemoryMap.cpp
===================================================================
--- source/Expression/IRMemoryMap.cpp
+++ source/Expression/IRMemoryMap.cpp
@@ -564,6 +564,22 @@
 }
 
 void
+IRMemoryMap::WriteMemory(lldb::addr_t process_address, const uint8_t *bytes, size_t size, lldb::ByteOrder byteOrder, Error &error)
+{
+    std::vector<uint8_t> temp;
+    if (byteOrder != GetByteOrder())
+    {
+        // Need to byte-swap the bytes before putting them in the map, otherwise they'll
+        // be interpreted with the wrong endianness when they're read back out.
+        temp.reserve(size);
+        typedef std::reverse_iterator<const uint8_t *> revit;
+        temp.assign(revit(bytes + size), revit(bytes));
+        bytes = temp.data();
+    }
+    WriteMemory(process_address, bytes, size, error);
+}
+
+void
 IRMemoryMap::WriteMemory (lldb::addr_t process_address, const uint8_t *bytes, size_t size, Error &error)
 {
     error.Clear();
Index: source/Expression/Materializer.cpp
===================================================================
--- source/Expression/Materializer.cpp
+++ source/Expression/Materializer.cpp
@@ -575,7 +575,7 @@
 
                 Error write_error;
 
-                map.WriteMemory(m_temporary_allocation, data.GetDataStart(), data.GetByteSize(), write_error);
+                map.WriteMemory(m_temporary_allocation, data.GetDataStart(), data.GetByteSize(), data.GetByteOrder(), write_error);
 
                 if (!write_error.Success())
                 {