* tree.def (RTL_EXPR): Update documentation.
	* tree.h (RTL_EXPR_HAS_NO_SCOPE): New macro.
	* expr.c (expand_expr): Handle RTL_EXPR_HAS_NO_SCOPE.
	* function.c (preserve_rtl_expr_temp): New function.
	(preserve_rtl_expr_temps): Likewise.
	(preserve_rtl_expr_result): Use it.

From-SVN: r32344