[patch] fix red zone altivec saving

[Eric Christopher]

So, it turns out that the red zone on ppc doesn't include the altivec  
registers. OK, no problem on those targets (ABI_V4) that happen to  
push the stack early enough. Unfortunately darwin isn't one of them  
so a little rearrangement is necessary. However, this doesn't really  
affect V4 much in that we just save the registers a little later in  
the sequence after we've pushed.

Tested by bootstrap and regression test on ppc-darwin. OK?

-eric

2007-03-25  Eric Christopher  <echristo@apple.com>

	* config/rs6000/rs6000.c (rs6000_emit_prologue): Move altivec register
	saving after stack push.

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