Infer whether a variable is assigned

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index d332f4a3cbcf15c8de64e998896f25b06b31532a..59a99026865e4fde1ca33ef0ba57f67da423778f 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -65,8 +65,7 @@ VariableProxy::VariableProxy(Zone* zone, Variable* var, int position)
       name_(var->name()),
       var_(NULL),  // Will be set by the call to BindTo.
       is_this_(var->is_this()),
-      is_trivial_(false),
-      is_lvalue_(false),
+      is_assigned_(false),
       interface_(var->interface()) {
   BindTo(var);
 }
@@ -81,8 +80,7 @@ VariableProxy::VariableProxy(Zone* zone,
       name_(name),
       var_(NULL),
       is_this_(is_this),
-      is_trivial_(false),
-      is_lvalue_(false),
+      is_assigned_(false),
       interface_(interface) {
   // Names must be canonicalized for fast equality checks.
   ASSERT(name->IsInternalizedString());
@@ -100,7 +98,7 @@ void VariableProxy::BindTo(Variable* var) {
   // eval() etc.  Const-ness and variable declarations are a complete mess
   // in JS. Sigh...
   var_ = var;
-  var->set_is_used(true);
+  var->set_is_used();
 }