[turbofan] Frame elision for code stubs

src/compiler/register-allocator.cc

Index: src/compiler/register-allocator.cc
diff --git a/src/compiler/register-allocator.cc b/src/compiler/register-allocator.cc
index cccf967227e8be2b2c77ad090a5cf233884991a2..4efa63d3835702189a4ddeb1110fcd50f6f1718d 100644
--- a/src/compiler/register-allocator.cc
+++ b/src/compiler/register-allocator.cc
@@ -3162,21 +3162,14 @@ void SpillSlotLocator::LocateSpillSlots() {
   for (TopLevelLiveRange* range : data()->live_ranges()) {
     if (range == nullptr || range->IsEmpty()) continue;
     // We care only about ranges which spill in the frame.
-    if (!range->HasSpillRange()) continue;
-    if (range->IsSpilledOnlyInDeferredBlocks()) {
-      for (LiveRange* child = range; child != nullptr; child = child->next()) {
-        if (child->spilled()) {
-          code->GetInstructionBlock(child->Start().ToInstructionIndex())
-              ->mark_needs_frame();
-        }
-      }
-    } else {
-      TopLevelLiveRange::SpillMoveInsertionList* spills =
-          range->GetSpillMoveInsertionLocations();
-      DCHECK_NOT_NULL(spills);
-      for (; spills != nullptr; spills = spills->next) {
-        code->GetInstructionBlock(spills->gap_index)->mark_needs_frame();
-      }
+    if (!range->HasSpillRange() || range->IsSpilledOnlyInDeferredBlocks()) {
+      continue;
+    }
+    TopLevelLiveRange::SpillMoveInsertionList* spills =
+        range->GetSpillMoveInsertionLocations();
+    DCHECK_NOT_NULL(spills);
+    for (; spills != nullptr; spills = spills->next) {
+      code->GetInstructionBlock(spills->gap_index)->mark_needs_frame();
     }
   }
 }
@@ -3639,7 +3632,7 @@ void LiveRangeConnector::CommitSpillsInDeferredBlocks(
     worklist.pop();
     if (done_blocks.Contains(block_id)) continue;
     done_blocks.Add(block_id);
-    const InstructionBlock* spill_block =
+    InstructionBlock* spill_block =
         code->InstructionBlockAt(RpoNumber::FromInt(block_id));
 
     for (const RpoNumber& pred : spill_block->predecessors()) {
@@ -3659,6 +3652,7 @@ void LiveRangeConnector::CommitSpillsInDeferredBlocks(
         data()->AddGapMove(spill_block->first_instruction_index(),
                            Instruction::GapPosition::START, pred_op,
                            spill_operand);
+        spill_block->mark_needs_frame();
       }
     }
   }