Remove some unnecessary binding initialization checks.

src/variables.cc

Index: src/variables.cc
diff --git a/src/variables.cc b/src/variables.cc
index d85e1b270ab30d452a3db4f84811a73458521c3b..6d85fd827155958da5a8b4e4e7af4957bd98b702 100644
--- a/src/variables.cc
+++ b/src/variables.cc
@@ -58,7 +58,8 @@ Variable::Variable(Scope* scope,
                    Handle<String> name,
                    VariableMode mode,
                    bool is_valid_LHS,
-                   Kind kind)
+                   Kind kind,
+                   InitializationFlag initialization_flag)
   : scope_(scope),
     name_(name),
     mode_(mode),
@@ -68,9 +69,12 @@ Variable::Variable(Scope* scope,
     local_if_not_shadowed_(NULL),
     is_valid_LHS_(is_valid_LHS),
     is_accessed_from_inner_scope_(false),
-    is_used_(false) {
-  // names must be canonicalized for fast equality checks
+    is_used_(false),
+    initialization_flag_(initialization_flag) {
+  // Names must be canonicalized for fast equality checks.
   ASSERT(name->IsSymbol());
+  // Var declared variables never need initialization.
+  ASSERT(!(mode == VAR && initialization_flag == NEEDS_INITIALIZATION));
 }