Patch (Darwin rs6000): Avoid saving LR to stack...

[Dale Johannesen]

...when the only reason to do so is that the PIC register was used.  
Instead,
save and restore LR in R0 around the magic PIC setup call.  (This is a
bigger win than you might expect; it often results in eliminating the 
stack
frame completely, and also may make the function a sibcall candidate.)
Bootstrapped and tested.

2005-06-03  Dale Johannesen  <dalej@apple.com>

         * config/rs6000/rs6000.c (rs6000_stack_info):  Don't set 
lr_save_p
         because Darwin PIC register used.
         (rs6000_emit_prologue):  Save LR in R0 around Darwin PIC setup,
         if not done by lr_save_p.

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