[kernel] Position on switch expression

pkg/kernel/lib/binary/ast_from_binary.dart

Index: pkg/kernel/lib/binary/ast_from_binary.dart
diff --git a/pkg/kernel/lib/binary/ast_from_binary.dart b/pkg/kernel/lib/binary/ast_from_binary.dart
index c4ab123429073d0e8a0a6b3f5f6e81d018ed7d26..449292e00d21bf288190acd0366adf3458ca3f97 100644
--- a/pkg/kernel/lib/binary/ast_from_binary.dart
+++ b/pkg/kernel/lib/binary/ast_from_binary.dart
@@ -1046,6 +1046,7 @@ class BinaryBuilder {
           ..fileOffset = offset
           ..bodyOffset = bodyOffset;
       case Tag.SwitchStatement:
+        var offset = readOffset();
         var expression = readExpression();
         int count = readUInt();
         List<SwitchCase> cases =
@@ -1064,7 +1065,7 @@ class BinaryBuilder {
           caseNode.body = readStatement()..parent = caseNode;
         }
         switchCaseStack.length -= count;
-        return new SwitchStatement(expression, cases);
+        return new SwitchStatement(expression, cases)..fileOffset = offset;
       case Tag.ContinueSwitchStatement:
         int index = readUInt();
         return new ContinueSwitchStatement(switchCaseStack[index]);