[Jikesrvm-core] please use VM.LittleEndian

[David P G. <gr...@us...>]

Hi,

        If you need to write code that is dependent  on then endianess of 
the target platform, please use VM.LittleEndian instead of VM.BuildForIA32 
or direct usage of the preprocessor directives.  I unified a few of these 
this morning, but there may still be some lurking around in the code base 
-- fix them as you find them.

thanks,

--dave