Fix for big-endian systems (#11295)
Fix for big-endian systems (#11295)

* RawByteMemory.ReadInt32/ReadUInt16 must always use little-endian
  byte order, therefore cannot use Marshal.ReadInt32/ReadInt16.
dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp,dsyme/fsharp