Tweak the TurboFan pipeline for stub compilation.

src/runtime/runtime.h

 // Copyright 2012 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.
 
 #ifndef V8_RUNTIME_RUNTIME_H_
 #define V8_RUNTIME_RUNTIME_H_
 
 #include "src/allocation.h"
 #include "src/objects.h"
 #include "src/zone.h"
@@ skipping 694 matching lines @@
   F(MapInitialize, 1, 1)                  \
   F(MapSet, 3, 1)                         \
   F(SetAdd, 2, 1)                         \
   F(SetClear, 1, 1)                       \
   F(SetDelete, 2, 1)                      \
   F(SetGetSize, 1, 1)                     \
   F(SetHas, 2, 1)                         \
   F(SetInitialize, 1, 1)                  \
   /* Arrays */                            \
   F(HasFastPackedElements, 1, 1)          \
-  F(GetPrototype, 1, 1)
+  F(GetPrototype, 1, 1)                   \
+  /* Strings */                           \
+  F(StringLength, 1, 1)                   \
+  /* JSValue */                           \
+  F(JSValueValue, 1, 1)
 
 
 #define FOR_EACH_INTRINSIC_RETURN_OBJECT(F) \
   RUNTIME_FUNCTION_LIST_ALWAYS_1(F)         \
   RUNTIME_FUNCTION_LIST_ALWAYS_2(F)         \
   RUNTIME_FUNCTION_LIST_ALWAYS_3(F)         \
   RUNTIME_FUNCTION_LIST_DEBUGGER(F)         \
   RUNTIME_FUNCTION_LIST_I18N_SUPPORT(F)     \
   INLINE_FUNCTION_LIST(F)                   \
   INLINE_OPTIMIZED_FUNCTION_LIST(F)
@@ skipping 166 matching lines @@
 
 class DeclareGlobalsEvalFlag : public BitField<bool, 0, 1> {};
 class DeclareGlobalsNativeFlag : public BitField<bool, 1, 1> {};
 STATIC_ASSERT(LANGUAGE_END == 3);
 class DeclareGlobalsLanguageMode : public BitField<LanguageMode, 2, 2> {};
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_RUNTIME_RUNTIME_H_