Add strong mode.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index d02a3488e96384698d2cd9f1c4f478549c1d2800..dd7bbfdb28460f825e7982f69aad9f618073bbfe 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -7619,8 +7619,8 @@ class HFunctionLiteral FINAL : public HTemplateInstruction<1> {
   class FunctionKindField : public BitField<FunctionKind, 0, 4> {};
   class PretenureField : public BitField<bool, 5, 1> {};
   class HasNoLiteralsField : public BitField<bool, 6, 1> {};
-  STATIC_ASSERT(LANGUAGE_END == 2);
-  class LanguageModeField : public BitField<LanguageMode, 7, 1> {};
+  STATIC_ASSERT(LANGUAGE_END == 3);
+  class LanguageModeField : public BitField<LanguageMode, 7, 2> {};
 
   Handle<SharedFunctionInfo> shared_info_;
   uint32_t bit_field_;