re PR middle-end/78468 (libgomp.c/reduction-10.c and many more FAIL)

re PR middle-end/78468 (libgomp.c/reduction-10.c and many more FAIL)

	PR middle-end/78468
	* emit-rtl.c (init_emit): Remove ??? comment.
	* explow.c (get_dynamic_stack_size): Take known alignment of stack
	pointer + STACK_DYNAMIC_OFFSET into account in lieu of STACK_BOUNDARY.
	* config/sparc/sparc.h (INIT_EXPANDERS): In 32-bit mode, lower the
	alignment of 3 virtual registers to BITS_PER_WORD.

	* config/sparc/sparc.c (sparc_compute_frame_size): Simplify.

Co-Authored-By: Dominik Vogt <vogt@linux.vnet.ibm.com>
From-SVN: r255616