Add version validation for LookupMap, also add unittest directly in LookupMap (take 2)

pkg/compiler/lib/src/diagnostics/messages.dart

Index: pkg/compiler/lib/src/diagnostics/messages.dart
diff --git a/pkg/compiler/lib/src/diagnostics/messages.dart b/pkg/compiler/lib/src/diagnostics/messages.dart
index 99aa824372b3e97eedd8a899eb49cf0fba56393f..b812fd3347de67b9a77f3d1f3e1edeaa5faba1ca 100644
--- a/pkg/compiler/lib/src/diagnostics/messages.dart
+++ b/pkg/compiler/lib/src/diagnostics/messages.dart
@@ -421,6 +421,7 @@ enum MessageKind {
   UNIMPLEMENTED_SETTER,
   UNIMPLEMENTED_SETTER_ONE,
   UNMATCHED_TOKEN,
+  UNRECOGNIZED_VERSION_OF_LOOKUP_MAP,
   UNSUPPORTED_BANG_EQ_EQ,
   UNSUPPORTED_EQ_EQ_EQ,
   UNSUPPORTED_LITERAL_SYMBOL,
@@ -3295,6 +3296,10 @@ $IMPORT_EXPERIMENTAL_MIRRORS_PADDING#{importChain}
           "more code and prevents the compiler from doing some optimizations.",
           howToFix: "Consider removing this 'noSuchMethod' implementation."),
 
+      MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP:
+        const MessageTemplate(MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP,
+          "Unsupported version of package:lookup_map.",
+          howToFix: DONT_KNOW_HOW_TO_FIX),
 
   }; // End of TEMPLATES.