powerpc/64: Use {SAVE,REST}_NVGPRS macros
In entry_64.S there are places that open code saving and restoring the non-volatile registers. There are already macros for doing this so use them. Signed-off-by: Jordan Niethe <jniethe5@gmail.com> Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20191211023552.16480-1-jniethe5@gmail.com
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