Allow control intructions to have side effects.

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index 4a08319044bf7f0768970f539a1a41ac3f298747..50311cfbc22ff02fdb8831daa13d083d50beaec6 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1115,8 +1115,10 @@ class BailoutId {
   static BailoutId Declarations() { return BailoutId(kDeclarationsId); }
   static BailoutId FirstUsable() { return BailoutId(kFirstUsableId); }
   static BailoutId StubEntry() { return BailoutId(kStubEntryId); }
+  static BailoutId PendingMarker() { return BailoutId(kPendingMarkerId); }
 
   bool IsNone() const { return id_ == kNoneId; }
+  bool IsPendingMarker() const { return id_ == kPendingMarkerId; }
   bool operator==(const BailoutId& other) const { return id_ == other.id_; }
 
  private:
@@ -1136,6 +1138,10 @@ class BailoutId {
   // Every compiled stub starts with this id.
   static const int kStubEntryId = 5;
 
+  // For Control instructions we cannot verify the ast_id, since there is no
+  // 1:1 mapping but it corresponds to two simulates for each branch.
+  static const int kPendingMarkerId = 6;
+
   int id_;
 };