Make closures optimizable by Crankshaft compiler.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 18cc25d43ace406da094b393662e0ad0704cbb7a..0bd973045a1aaf3dc1c476c910cbd9e97cb22930 100755
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -92,6 +92,25 @@ CompilationInfo::CompilationInfo(Handle<JSFunction> closure)
 }
 
 
+void CompilationInfo::DisableOptimization() {
+  if (FLAG_optimize_closures) {
+    // If we allow closures optimizations and it's an optimizable closure
+    // mark it correspondingly.
+    bool is_closure = closure_.is_null() && !scope_->HasTrivialOuterContext();
+    if (is_closure) {
+      bool is_optimizable_closure =
+          !scope_->outer_scope_calls_eval() && !scope_->inside_with();
+      if (is_optimizable_closure) {
+        SetMode(BASE);
+        return;
+      }
+    }
+  }
+
+  SetMode(NONOPT);
+}
+
+
 // Determine whether to use the full compiler for all code. If the flag
 // --always-full-compiler is specified this is the case. For the virtual frame
 // based compiler the full compiler is also used if a debugger is connected, as