[stubs] Improve code generation for ToBoolean.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index 6035a9ee4aa286073aa9bceb1c3a447db3d7fd61..9df6bbb42c44a75d0522ac19b4037b884615180d 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -7553,7 +7553,7 @@ class Internals {
       1 * kApiPointerSize + kApiIntSize;
   static const int kStringResourceOffset = 3 * kApiPointerSize;
 
-  static const int kOddballKindOffset = 5 * kApiPointerSize + sizeof(double);
+  static const int kOddballKindOffset = 4 * kApiPointerSize + sizeof(double);
   static const int kForeignAddressOffset = kApiPointerSize;
   static const int kJSObjectHeaderSize = 3 * kApiPointerSize;
   static const int kFixedArrayHeaderSize = 2 * kApiPointerSize;