[turbofan] Add Disallow* scopes to dead code elimination.

No changes were necessary.

R=jarin@chromium.org

Bug: v8:7790
Change-Id: I70efc56dd07f778dffda3b38f28b9b94d634361e
Reviewed-on: https://chromium-review.googlesource.com/1128739Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54313}

src/compiler/dead-code-elimination.cc

@@ -46,6 +46,10 @@ Node* FindDeadInput(Node* node) {
 }  // namespace
 
 Reduction DeadCodeElimination::Reduce(Node* node) {
+  DisallowHeapAllocation no_heap_allocation;
+  DisallowHandleAllocation no_handle_allocation;
+  DisallowHandleDereference no_handle_dereference;
+  DisallowCodeDependencyChange no_dependency_change;
   switch (node->opcode()) {
     case IrOpcode::kEnd:
       return ReduceEnd(node);