Add testing of generated (ARM) baseline decoders using hand-written decoders.

src/trusted/validator_arm/generate_decoder.py

Index: src/trusted/validator_arm/generate_decoder.py
===================================================================
--- src/trusted/validator_arm/generate_decoder.py	(revision 10678)
+++ src/trusted/validator_arm/generate_decoder.py	(working copy)
@@ -22,6 +22,8 @@
         generated actual classes.
   --auto-baseline-sep=name - Use as separator to split up automatically
         generated baseline classes.
+  --test-base=name - Test automatically genererated baseline for the
+        decoder table with the given name. May be repeated.
 
   name - Only generate tests for table 'name'. May be repeated.
 
@@ -63,6 +65,7 @@
                'auto-actual': [],
                'auto-actual-sep': [],
                'auto-baseline-sep': [],
+               'test-base': [],
                'table_remove': [],
                'table': [],
                }