Remove unused Scope::force_context_allocation_

R=verwaest@chromium.org

Change-Id: Ibbf382ec1f7200142ebccc8eed6fe5dd1c2804bd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1701846Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Yang Guo <yangguo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62710}

src/ast/scopes.cc

@@ -264,7 +264,6 @@ void Scope::SetDefaults() {
   is_debug_evaluate_scope_ = false;
 
   inner_scope_calls_eval_ = false;
-  force_context_allocation_ = false;
   force_context_allocation_for_parameters_ = false;
 
   is_declaration_scope_ = false;

src/ast/scopes.h

@@ -714,7 +714,6 @@ class V8_EXPORT_PRIVATE Scope : public NON_EXPORTED_BASE(ZoneObject) {
 
   // True if one of the inner scopes or the scope itself calls eval.
   bool inner_scope_calls_eval_ : 1;
-  bool force_context_allocation_ : 1;
   bool force_context_allocation_for_parameters_ : 1;
 
   // True if it holds 'var' declarations.