[COMMITTED] Fix PR 20636, RTL checking failure in rs6000.md

[Andrew Pinski]

I applied this obvious fix to fix PR 20636.  The problem was we were 
not checking
to make sure that we have a REG before taking the REGNO of the operand.
The behavior is only found on the mainline after the following change.

2005-03-13  David Edelsohn  <edelsohn@gnu.org>

	* config/rs6000/rs6000.md (extendsfdf2): Change operand1 predicate
	to reg_or_none500mem_operand.
	(extendsfdf2_fpr): Add MEM alternative.
	(extenddftf2_internal): Change operand2 predicate to
	zero_reg_mem_operand.

Thanks,
Andrew Pinski

ChangeLog:
	* config/rs6000/rs6000.md (extendsfdf2_fpr): Check to make
	sure that we have a REG before getting its REGNO.


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