[Ada] Lift restriction on renaming with Volatile_Full_Access

[Arnaud Charlet <charlet at adacore dot com>]

An arbitrary restriction was imposed on renaming in conjunction with the new
Aspect/Pragma Volatile_Full_Access for implementation reasons: the compiler
was rejecting renamings of components of Volatile_Full_Access objects.

It is lifted by this change and the following package must now be accepted:

package RenamVFA is
   type Int8_t is mod 2**8;
   type Rec is record
     A,B,C,D : Int8_t;
   end record;
   for Rec'Size use 32;
   for Rec'Alignment use 4;
   pragma Volatile_Full_Access (Rec);
   R : Rec;
   I1 : Int8_t renames R.A;
   type Arr is array (1 .. 4) of Int8_t;
   pragma Volatile_Full_Access (Arr);
   A : Arr;
   I2 : Int8_t renames A (1);
end RenamVFA;

Tested on x86_64-pc-linux-gnu, committed on trunk

2015-05-26  Eric Botcazou  <ebotcazou@adacore.com>

	* sem_ch8.adb (Analyze_Object_Renaming): Lift restriction on
	components of Volatile_Full_Access objects.

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