[rs6000] Add register save/restore routines for cross

[Eric Botcazou]

Hi,

this adds the register save/restore routines to libgcc for a couple of cross 
platforms that we use (powerpc-elf and powerpc-wrs-vxworks).  OK for mainline?


2013-05-20  Eric Botcazou  <ebotcazou@adacore.com>

libgcc/
	* config.host (powerpc-*-elf*): Add rs6000/t-savresfgpr to tmake_file.
	(powerpc-wrs-vxworks): Likewise.


-- 
Eric Botcazou
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