Revert of Remove redundant ParseInfo::scope_.

src/ast/scopes.cc

Index: src/ast/scopes.cc
diff --git a/src/ast/scopes.cc b/src/ast/scopes.cc
index 5211e082e0aa987eebea4d9985444a9bc22e4d32..f272931b9258a01afe4573718db2861c322fc828 100644
--- a/src/ast/scopes.cc
+++ b/src/ast/scopes.cc
@@ -368,6 +368,7 @@
 
 bool Scope::Analyze(ParseInfo* info) {
   DCHECK(info->literal() != NULL);
+  DCHECK(info->scope() == NULL);
   DeclarationScope* scope = info->literal()->scope();
   DeclarationScope* top = scope;
 
@@ -395,6 +396,7 @@
   scope->CheckZones();
 #endif
 
+  info->set_scope(scope);
   return true;
 }