Patch AVR: fix call prologue saves for avr6

[Tristan Gingold]

Hi,

this is a tiny patch to fix the use of prologue_saves on avr6.  As  
EIND is always 0, a stub must be
generated (if required) for the return point.

Tested by recompiling GCC.

Tristan.

2008-05-21  Tristan Gingold  <gingold@adacore.com>

	* config/avr/avr.md ("call_prologue_saves"): Use hi8(gs())/lo8(gs())
	instead of pm_lo8/pm_hi8 to makes this call working on avr6.

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