Make constant lists immutable.

lib/compiler/implementation/ssa/codegen.dart

Index: lib/compiler/implementation/ssa/codegen.dart
diff --git a/lib/compiler/implementation/ssa/codegen.dart b/lib/compiler/implementation/ssa/codegen.dart
index 8784c2b9ffda835e34308f2dc83adf128a451fe9..b71c0cced783bcd4be268484cce8999409fa933a 100644
--- a/lib/compiler/implementation/ssa/codegen.dart
+++ b/lib/compiler/implementation/ssa/codegen.dart
@@ -1386,6 +1386,14 @@ class SsaCodeGenerator implements HVisitor {
     endExpression(JSPrecedence.EQUALITY_PRECEDENCE);
   }
 
+  void checkImmutableArray(HInstruction input) {
+    beginExpression(JSPrecedence.PREFIX_PRECEDENCE);
+    buffer.add('!!');
+    use(input, JSPrecedence.MEMBER_PRECEDENCE);
+    buffer.add('.immutable\$list');
+    endExpression(JSPrecedence.PREFIX_PRECEDENCE);
+  }
+
   void checkNull(HInstruction input) {
     beginExpression(JSPrecedence.EQUALITY_PRECEDENCE);
     use(input, JSPrecedence.EQUALITY_PRECEDENCE);
@@ -1571,6 +1579,15 @@ class SsaOptimizedCodeGenerator extends SsaCodeGenerator {
       checkString(input, '!==');
       buffer.add(') ');
       bailout(node, 'Not a string');
+    } else if (node.isMutableArray()) {
+      buffer.add('if (');
+      checkObject(input, '!==');
+      buffer.add('||');
+      checkArray(input, '!==');
+      buffer.add('||');
+      checkImmutableArray(input);
+      buffer.add(') ');
+      bailout(node, 'Not a mutable array');      
     } else if (node.isArray()) {
       buffer.add('if (');
       checkObject(input, '!==');