[turbofan] Add Disallow* scopes to checkpoint elimination.

No changes were needed.

R=jarin@chromium.org

Bug: v8:7790
Change-Id: I5842a39db1395ab25f61aab2443c0061f613a883
Reviewed-on: https://chromium-review.googlesource.com/1128897Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54342}

src/compiler/checkpoint-elimination.cc

@@ -39,6 +39,11 @@ Reduction CheckpointElimination::ReduceCheckpoint(Node* node) {
 }
 
 Reduction CheckpointElimination::Reduce(Node* node) {
+  DisallowHeapAllocation no_heap_allocation;
+  DisallowHandleAllocation no_handle_allocation;
+  DisallowHandleDereference no_handle_dereference;
+  DisallowCodeDependencyChange no_dependency_change;
+
   switch (node->opcode()) {
     case IrOpcode::kCheckpoint:
       return ReduceCheckpoint(node);