Remove some initialization checks based on source positions.

src/variables.h

Index: src/variables.h
diff --git a/src/variables.h b/src/variables.h
index c2f78fe256ac9669acc2d6dc27149721ec0da3fd..9e96a46851f459f59707e9fe28a1af162cdb3746 100644
--- a/src/variables.h
+++ b/src/variables.h
@@ -103,6 +103,9 @@ class Variable: public ZoneObject {
   bool is_used() { return is_used_; }
   void set_is_used(bool flag) { is_used_ = flag; }
 
+  int initializer_position() { return initializer_position_; }
+  void set_initializer_position(int pos) { initializer_position_ = pos; }
+
   bool IsVariable(Handle<String> n) const {
     return !is_this() && name().is_identical_to(n);
   }
@@ -163,6 +166,7 @@ class Variable: public ZoneObject {
   Kind kind_;
   Location location_;
   int index_;
+  int initializer_position_;
 
   // If this field is set, this variable references the stored locally bound
   // variable, but it might be shadowed by variable bindings introduced by