Revert of Remove Scope::scope_uses_this_ flag

src/scopes.h

Index: src/scopes.h
diff --git a/src/scopes.h b/src/scopes.h
index f3c64f9eadf73c7c4f9c1671779c4f55926697f9..92f5c4cf72e73aff6bbdf5e09914de835d535f45 100644
--- a/src/scopes.h
+++ b/src/scopes.h
@@ -217,6 +217,9 @@
 
   // Inform the scope that the corresponding code uses "super".
   void RecordSuperPropertyUsage() { scope_uses_super_property_ = true; }
+
+  // Inform the scope that the corresponding code uses "this".
+  void RecordThisUsage() { scope_uses_this_ = true; }
 
   // Set the language mode flag (unless disabled by a global flag).
   void SetLanguageMode(LanguageMode language_mode) {
@@ -321,6 +324,10 @@
   bool inner_uses_super_property() const {
     return inner_scope_uses_super_property_;
   }
+  // Does this scope access "this".
+  bool uses_this() const { return scope_uses_this_; }
+  // Does any inner scope access "this".
+  bool inner_uses_this() const { return inner_scope_uses_this_; }
 
   const Scope* NearestOuterEvalScope() const {
     if (is_eval_scope()) return this;
@@ -585,6 +592,8 @@
   bool scope_uses_arguments_;
   // This scope uses "super" property ('super.foo').
   bool scope_uses_super_property_;
+  // This scope uses "this".
+  bool scope_uses_this_;
   // This scope contains an "use asm" annotation.
   bool asm_module_;
   // This scope's outer context is an asm module.
@@ -600,6 +609,7 @@
   bool inner_scope_calls_eval_;
   bool inner_scope_uses_arguments_;
   bool inner_scope_uses_super_property_;
+  bool inner_scope_uses_this_;
   bool force_eager_compilation_;
   bool force_context_allocation_;