[Ada] Fix internal error on loop over array with misaligned index

[Eric Botcazou]

This is a regression present on the mainline.  The compiler aborts on a loop 
running over an array whose index type is a misaligned scalar type at -O3.

We're just forgetting to lift the padding type around the scalar type.

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


2013-06-03  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/trans.c (Raise_Error_to_gnu) <CE_Index_Check_Failed>:
	Record the unpadded type of the index type on the RCI stack.


2013-06-03  Eric Botcazou  <ebotcazou@adacore.com>

	* gnat.dg/loop_optimization15.ad[sb]: New test.


-- 
Eric Botcazou
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