mips64 xlr processor support

[Sandip Matte]

Hello,

This patch adds support for RMI Corp's mips64 xlr processor. 
New option -march=xlr and -mtune=xlr are added for xlr 
processor. Tested mips64-unknown-linux-gnu with -march=xlr and 
-mtune=xlr.

Thanks,
Sandip

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