How to migrate POINTER_TYPE_OVERFLOW_UNDEFINED for GCC v8.x?

[Leslie Zhai]

Hi GCC developers,

As ChangeLog mentioned:

2017-08-01  Bin Cheng <bin.cheng@arm.com>

     * tree.h (POINTER_TYPE_OVERFLOW_UNDEFINED): Delete.


Then how to migrate it for GCC v8.x? for example:

Constant *Result = POINTER_TYPE_OVERFLOW_UNDEFINED ? A : B;

migrated to

Constant *Result = A;


because there was a patch 'Make pointer overflow always undefined and 
remove the macro' https://patchwork.ozlabs.org/patch/792677/

please give me some hint, thanks a lot!

-- 
Regards,
Leslie Zhai - a LLVM developer https://reviews.llvm.org/p/xiangzhai/