pa.h (BIGGEST_ALIGNMENT): Change 32-bit value to 64 bits.

	* pa.h (BIGGEST_ALIGNMENT): Change 32-bit value to 64 bits.
	(MAX_PARM_BOUNDARY, STACK_BOUNDARY): Express in terms of
	BIGGEST_ALIGNMENT.
	(PREFERRED_STACK_BOUNDARY): Express in terms of STACK_BOUNDARY.
	(FUNCTION_BOUNDARY): Express in terms of BITS_PER_WORD.

From-SVN: r60056