[turbofan] Single entry into deferred regions

src/compiler/register-allocator-verifier.h

Index: src/compiler/register-allocator-verifier.h
diff --git a/src/compiler/register-allocator-verifier.h b/src/compiler/register-allocator-verifier.h
index 251840658ce97781c08e4f222fa8829e37aa7ff4..06d9029a54f37c9f14ecef0ade8e4294b30165a5 100644
--- a/src/compiler/register-allocator-verifier.h
+++ b/src/compiler/register-allocator-verifier.h
@@ -74,9 +74,9 @@ class PendingAssessment final : public Assessment {
                              InstructionOperand operand)
       : Assessment(Pending), origin_(origin), operand_(operand) {}
 
-  static PendingAssessment* cast(Assessment* assessment) {
+  static const PendingAssessment* cast(const Assessment* assessment) {
     CHECK(assessment->kind() == Pending);
-    return static_cast<PendingAssessment*>(assessment);
+    return static_cast<const PendingAssessment*>(assessment);
   }
 
   const InstructionBlock* origin() const { return origin_; }