Make closures optimizable by Crankshaft compiler.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index e4864e48015df3ef51186b5f814920b6d5364518..88f2d6befb3eea622b9c290346b7a821e2625c0a 100755
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -665,6 +665,14 @@ Handle<SharedFunctionInfo> Compiler::BuildFunctionInfo(FunctionLiteral* literal,
       if (!MakeCrankshaftCode(&info)) {
         return Handle<SharedFunctionInfo>::null();
       }
+      if (FLAG_optimize_closures
+          && !AlwaysFullCompiler()
+          && !info.scope()->HasTrivialOuterContext()
+          && !info.scope()->outer_scope_calls_eval()
+          && !info.scope()->inside_with()) {
+        ASSERT(info.code()->kind() == Code::FUNCTION);
+        info.code()->set_optimizable(true);
+      }
     } else {
       // The bodies of function literals have not yet been visited by the
       // AST optimizer/analyzer.