cp-gimplify.c (cp_gimplify_expr): Use get_initialized_tmp_var.

	* cp-gimplify.c (cp_gimplify_expr): Use get_initialized_tmp_var.

The comment for get_formal_tmp_var says that it shouldn't be used for
expressions whose value might change between initialization and use, and in
this case we're creating a temporary precisely because the value might
change, so we should use get_initialized_tmp_var instead.

I also noticed that many callers of get_initialized_tmp_var pass NULL for
post_p, so it seems appropriate to make it a default argument.

gcc/
	* gimplify.h (get_initialized_tmp_var): Add default argument to
	post_p.
	* gimplify.c (gimplify_self_mod_expr, gimplify_omp_atomic): Remove
	NULL post_p argument.
	* targhooks (std_gimplify_va_arg_expr): Likewise.

From-SVN: r277128

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