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[Ada] Expand Enum_Rep attribute reference in GNATprove mode


In the special GNATprove mode for proof of programs, expand the Enum_Rep
attribute reference so that a suitable static integer is in the AST
where required by the rest of analysis.

There is no impact on compilation.

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

2019-07-09  Yannick Moy  <moy@adacore.com>

gcc/ada/

	* exp_spark.adb (Expand_SPARK_N_Attribute_Reference): Expand
	attribute reference on Enum_Rep.
--- gcc/ada/exp_spark.adb
+++ gcc/ada/exp_spark.adb
@@ -26,6 +26,7 @@
 with Atree;    use Atree;
 with Checks;   use Checks;
 with Einfo;    use Einfo;
+with Exp_Attr;
 with Exp_Ch4;
 with Exp_Ch5;  use Exp_Ch5;
 with Exp_Dbug; use Exp_Dbug;
@@ -196,6 +197,12 @@ package body Exp_SPARK is
              Parameter_Associations => New_List (Expr)));
          Analyze_And_Resolve (N, Typ);
 
+      --  Whenever possible, replace a prefix which is an enumeration literal
+      --  by the corresponding literal value.
+
+      elsif Attr_Id = Attribute_Enum_Rep then
+         Exp_Attr.Expand_N_Attribute_Reference (N);
+
       --  For attributes which return Universal_Integer, introduce a conversion
       --  to the expected type with the appropriate check flags set.
 


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