[PATCH] Fix offsettable memory reference pb on PowerPC/AIX

[David Edelsohn]

	* config/rs6000/rs6000-protos.h (rs6000_offsettable_memref_p):
          Declare.
	  * config/rs6000/rs6000.c (rs6000_offsettable_memref_p): New
          predicate.
	  (rs6000_split_multireg_move): Use it instead of
          offsettable_memref_p.
	  * config/rs6000/rs6000.md (movdf_hardfloat32): Use it instead of
	  a less accurate predicate.

Okay, but please perform the complete reversion that Alan Modra suggests.

Thanks, David