[ast] Make --print-scopes indicate a scope's forced context allocation.

src/ast/scopes.cc

Index: src/ast/scopes.cc
diff --git a/src/ast/scopes.cc b/src/ast/scopes.cc
index c351f1d0d6f50d3ac39216ab3754f045b34b72a4..97c149839c6af6ffd2b421db0569e201bb8271d9 100644
--- a/src/ast/scopes.cc
+++ b/src/ast/scopes.cc
@@ -1541,6 +1541,9 @@ void Scope::Print(int n) {
     if (scope->was_lazily_parsed()) Indent(n1, "// lazily parsed\n");
     if (scope->ShouldEagerCompile()) Indent(n1, "// will be compiled\n");
   }
+  if (has_forced_context_allocation()) {
+    Indent(n1, "// forces context allocation\n");
+  }
   if (num_stack_slots_ > 0) {
     Indent(n1, "// ");
     PrintF("%d stack slots\n", num_stack_slots_);