Add `debug.adc` and option DEBUG

The GNAT configuration file `debug.adc` has Assertion_Policy Debug
enabled to compile `pragma Debug` code. If `DEBUG` is set to `1`
during build, `debug.adc` is used instead of the default `gnat.adc`.

Change-Id: If5b52f5251cae7deed7aca2765f9b5db1c148fb7
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/20558
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/debug.adc b/debug.adc
new file mode 100644
index 0000000..536a5a3
--- /dev/null
+++ b/debug.adc
@@ -0,0 +1,24 @@
+pragma Restrictions (No_Allocators);
+pragma Restrictions (No_Calendar);
+pragma Restrictions (No_Dispatch);
+pragma Restrictions (No_Fixed_Point);
+pragma Restrictions (No_Floating_Point);
+pragma Restrictions (No_Implicit_Dynamic_Code);
+pragma Restrictions (No_Implicit_Heap_Allocations);
+pragma Restrictions (No_Implicit_Loops);
+pragma Restrictions (No_Initialize_Scalars);
+pragma Restrictions (No_Local_Allocators);
+pragma Restrictions (No_Recursion);
+pragma Restrictions (No_Streams);
+pragma Restrictions (No_Tasking);
+pragma Restrictions (No_Unchecked_Access);
+pragma Restrictions (No_Unchecked_Deallocation);
+pragma Restrictions (No_Wide_Characters);
+pragma Restrictions (Static_Storage_Size);
+pragma Assertion_Policy
+  (Statement_Assertions => Disable,
+   Debug                => Check,
+   Pre                  => Disable,
+   Post                 => Disable);
+pragma Overflow_Mode (General => Strict, Assertions => Eliminated);
+pragma SPARK_Mode (On);