[Ada] Fix GDB output for fields in variable-length records

[Eric Botcazou]

Some fields in variable-length records are not properly decoded and thus 
garbage data is displayed by the debugger.

Tested on x86_64-suse-linux, applied on the mainline.


2015-06-01  Pierre-Marie de Rodat  <derodat@adacore.com>

	* gcc-interface/utils.c (scale_by_factor_of): When handling a function
	call expression, process the corresponding function body.  Also handle
	potential addends.


-- 
Eric Botcazou
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