[turbofan] Regalloc validator: support same block pending assessment

src/compiler/register-allocator-verifier.cc

Index: src/compiler/register-allocator-verifier.cc
diff --git a/src/compiler/register-allocator-verifier.cc b/src/compiler/register-allocator-verifier.cc
index 0bc6a32d78fa9ae11ed6cedb4ae778fd7893ff1c..c2c55f52d3f97e44f4083337a3b7490b5670f673 100644
--- a/src/compiler/register-allocator-verifier.cc
+++ b/src/compiler/register-allocator-verifier.cc
@@ -470,7 +470,9 @@ void RegisterAllocatorVerifier::ValidateFinalAssessment(
   const PendingAssessment* old = assessment->original_pending_assessment();
   CHECK_NOT_NULL(old);
   RpoNumber old_block = old->origin()->rpo_number();
-  BlockAssessments* old_block_assessments = assessments_[old_block];
+  DCHECK_LE(old_block, block_id);
+  BlockAssessments* old_block_assessments =
+      old_block == block_id ? current_assessments : assessments_[old_block];
   ValidatePendingAssessment(old_block, op, old_block_assessments, old,
                             virtual_register);
 }