Wrong value printed by info locals for dynamic object.

The problem is printing the wrong value for dynamic local variables
when using the "info locals" command. Consider the following code:

   procedure Print (I1 : Positive; I2 : Positive) is
      type My_String is array (I1 .. I2) of Character;
      I : My_String := (others => 'A');
      S : String (1 .. I2 + 3) := (others => ' ');
   begin
      S (I1 .. I2) := String (I); --  BREAK
      Put_Line (S);
   end Print;

After the debugger stopped at BREAK, we try printing all local variables.
Here is what we get:

        (gdb) info locals
        i = "["00"]["00"]"
        s = "["00"]["00"]["00"]["00"]["00"]["00"]["00"]["00"]"

Curiously, printing their value using the "print" command works:

        (gdb) print i
        $1 = "AA"
        (gdb) print s
        $2 = "        "

We traced the problem to trying to get the contents of a variable
(call to value_contents) before "fix'ing" it.  For those not familiar
with the Ada language support, "fixing" a value consists of swapping
the value's dynamic type with a static version that is appropriate
for our actual value.  As a result, the dynamic type was used to
determine the value size, which is zero, and thus the value contents
was empty.

gdb/ChangeLog:

        * valprint.c (common_val_print): Fix the value before extracting
        its contents.
        * ada-lang.c (ada_to_fixed_value): Make this function extern.
        * ada-lang.h (ada_to_fixed_value): New function declaration.
        * ada-valprint.c (ada_value_print): Use ada_to_fixed_value
        to avoid code duplication and fix a bug in the handling of
        fixed types contents.

gdb/testsuite/ChangeLog:

        * gdb.ada/dyn_loc: New testcase.

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