Fix legit address for powerpc-xilinx-eabi

[Michael Eager]

Michael Eager wrote:
> The attached patch makes rs6000_legitimate_address return
> true for DImode or DFmode only if double-precision FP regs
> are present.
> 


-- 
Michael Eager	 eager@eagercon.com
1960 Park Blvd., Palo Alto, CA 94306  650-325-8077
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