[kernel] Debugging of switch statement

pkg/compiler/lib/src/kernel/kernel_visitor.dart

Index: pkg/compiler/lib/src/kernel/kernel_visitor.dart
diff --git a/pkg/compiler/lib/src/kernel/kernel_visitor.dart b/pkg/compiler/lib/src/kernel/kernel_visitor.dart
index f8598a179808c5304ea1a9f2ac3366c75edd5a51..5e1147a1555bfda29652b71069dc1aaa940bf66c 100644
--- a/pkg/compiler/lib/src/kernel/kernel_visitor.dart
+++ b/pkg/compiler/lib/src/kernel/kernel_visitor.dart
@@ -1022,10 +1022,15 @@ class KernelVisitor extends Object
         assert(labelOrCase.asLabel() != null);
       }
     }
+    List<int> expressionsOffsets = <int>[];

[Kevin Millikin (Google), 2017/03/20 12:29:47]

Do this in the loop above.  expressionsOffsets ==> expressionOffsets.

[jensj, 2017/03/21 10:06:19]

Done.

+    for (ir.Expression expression in expressions) {
+      expressionsOffsets.add(expression.fileOffset);
+    }
     // We ignore the node's statements here, they're generated below in
     // [visitSwitchStatement] once we've set up all the jump targets.
     return associateNode(
-        new ir.SwitchCase(expressions, null, isDefault: node.isDefaultCase),
+        new ir.SwitchCase(expressions, expressionsOffsets, null,
+            isDefault: node.isDefaultCase),
         node);
   }