Fix minor regression with size functions

[Eric Botcazou]

It's a minor regression present on mainline and 4.8 branch: the size functions 
are output as (no-fn) in the .original dump file.

Bootstrapped/regtested on x86_64-suse-linux, applied on the mainline and 4.8 
branch as obvious (this only affects the Ada compiler).


2013-04-28  Eric Botcazou  <ebotcazou@adacore.com>

	* stor-layout.c (finalize_size_functions): Allocate a structure and
	reset cfun before dumping the functions.


-- 
Eric Botcazou
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