pa.c (output_function_prologue): Combine stack adjustment and first GR save when reasonable to do so.

	* pa.c (output_function_prologue): Combine stack adjustment and
	first GR save when reasonable to do so.
	(output_function_epilogue): Combine stack adjustment and first
	GR restore when reasonable to do so.  Avoid load/use stall for
	RP restore in common cases.

From-SVN: r3246