* c-gimplify.c (gimplify_c_loop): Improve initial implementations

	* c-gimplify.c (gimplify_c_loop): Improve initial implementations
	for loops whose conditions are known at compile-time.
	* gimplify.c (append_to_statement_list_1): Remove side_effects
	parameter, this function should never be called if its false.
	(append_to_statement_list): Only call append_to_statement_list_1
	if t is non-NULL tree with side-effects.
	(append_to_statement_list_force):  Likewise, if t is not NULL.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@91784 138bc75d-0d04-0410-961f-82ee72b054a4