TableGen: Allow target specific MCOI operand types

[Tom Stellard]

Hi,

I'm resending these, in case the they were lost during the mailing
list outage.

The attached patches allow targets to specify their own operand types
to be used in MCOperandInfo objects.  The first patch makes this
change to tablegen, and the second updates the R600 backend to take
advantage of this.

This replaces my previous patch which added an AsmOperandClass member
to the TableGen Register class.

-Tom

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