Reuse AstValueFactory when optimizing.

src/hydrogen.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/hydrogen.h"
 
 #include <algorithm>
 
 #include "src/v8.h"
 #include "src/allocation-site-scopes.h"
@@ skipping 7607 matching lines @@
 
   // We don't want to add more than a certain number of nodes from inlining.
   if (inlined_count_ > Min(FLAG_max_inlined_nodes_cumulative,
                            kUnlimitedMaxInlinedNodesCumulative)) {
     TraceInline(target, caller, "cumulative AST node limit reached");
     return false;
   }
 
   // Parse and allocate variables.
   CompilationInfo target_info(target, zone());
+  // Use the same AstValueFactory for creating strings in the sub-compilation
+  // step, but don't transfer ownership to target_info.
+  target_info.SetAstValueFactory(top_info()->ast_value_factory(), false);
   Handle<SharedFunctionInfo> target_shared(target->shared());
   if (!Parser::Parse(&target_info) || !Scope::Analyze(&target_info)) {
     if (target_info.isolate()->has_pending_exception()) {
       // Parse or scope error, never optimize this function.
       SetStackOverflow();
       target_shared->DisableOptimization(kParseScopeError);
     }
     TraceInline(target, caller, "parse failure");
     return false;
   }
@@ skipping 4779 matching lines @@
   if (ShouldProduceTraceOutput()) {
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 } }  // namespace v8::internal