Properly blacklist ES6 for-of statement for TurboFan.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index 22b35943f25e1d3f148fdce3c830e31cb0b10cbb..e0c8ae3d25ef9b0ca5be9194010e3b1235781f20 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -401,6 +401,8 @@ OptimizedCompileJob::Status OptimizedCompileJob::CreateGraph() {
       // TODO(turbofan): Make try-catch work and remove this bailout.
       info()->function()->dont_optimize_reason() != kTryCatchStatement &&
       info()->function()->dont_optimize_reason() != kTryFinallyStatement &&
+      // TODO(turbofan): Make ES6 for-of work and remove this bailout.
+      info()->function()->dont_optimize_reason() != kForOfStatement &&
       // TODO(turbofan): Make OSR work and remove this bailout.
       !info()->is_osr()) {
     compiler::Pipeline pipeline(info());