cris.c (cris_target_asm_function_prologue): Do not emit pic register load if "internal" visibility.

	* config/cris/cris.c (cris_target_asm_function_prologue):  Do not
	emit pic register load if "internal" visibility.
	(cris_print_operand): Avoid traditional-warning for 0xffffffff.
	(cris_expand_builtin_va_arg): Do all computations on trees.

From-SVN: r50627