[Ada] Remove left-overs of Unaligned_Valid attribute

[Pierre-Marie de Rodat via Gcc-patches]

The support for the attribute itself was removed a long time ago.

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

gcc/ada/

        * exp_attr.adb (Expand_Fpt_Attribute): Likewise.
        * snames.ads-tmpl (Name_Unaligned_Valid): Delete.
diff --git a/gcc/ada/exp_attr.adb b/gcc/ada/exp_attr.adb
--- a/gcc/ada/exp_attr.adb
+++ b/gcc/ada/exp_attr.adb
@@ -165,8 +165,7 @@ package body Exp_Attr is
    --  the appropriate instantiation of System.Fat_Gen. Float arguments in Args
    --  have already been converted to the floating-point type for which Pkg was
    --  instantiated. The Nam argument is the relevant attribute processing
-   --  routine to be called. This is the same as the attribute name, except in
-   --  the Unaligned_Valid case.
+   --  routine to be called. This is the same as the attribute name.
 
    procedure Expand_Fpt_Attribute_R (N : Node_Id);
    --  This procedure expands a call to a floating-point attribute function


diff --git a/gcc/ada/snames.ads-tmpl b/gcc/ada/snames.ads-tmpl
--- a/gcc/ada/snames.ads-tmpl
+++ b/gcc/ada/snames.ads-tmpl
@@ -1400,7 +1400,6 @@ package Snames is
    --  Note that the UP_ prefix means use the rest of the name in uppercase,
    --  e.g. Name_UP_RESULT corresponds to the name "RESULT".
 
-   Name_Unaligned_Valid                  : constant Name_Id := N + $;
    Name_UP_RESULT                        : constant Name_Id := N + $;
    Name_Suspension_Object                : constant Name_Id := N + $;
    Name_Synchronous_Task_Control         : constant Name_Id := N + $;