* expr.c (STACK_BYTES): Delete unused macro.
	* calls.c: Provide default for PREFERRED_STACK_BOUNDARY.
	(STACK_BYTES): Use PREFERRED_STACK_BOUNDARY, not STACK_BOUNDARY.
	(expand_call): Likewise.
	(emit_library_call): Likewise.
	(emit_library_call_value): Likewise.
	* function.c: Provide default for PREFERRED_STACK_BOUNDARY.
	(STACK_BYTES): Use PREFERRED_STACK_BOUNDARY, not STACK_BOUNDARY.
	* explow.c: Provide default for PREFERRED_STACK_BOUNDARY.
	(round_push): Use PREFERRED_STACK_BOUNDARY, not STACK_BOUNDARY.
	(allocate_dynamic_stack_space): Likewise.
	* tm.texi (PREFERRED_STACK_BOUNDARY): Document new macro.
	(STACK_BOUNDARY): Update description to reflect the new situation.

From-SVN: r23730