[PATCH] Implement ADRP CSE for global symbols

[Jiangning Liu]

Hi Quenin,

Thanks for your testing!

  It appears that your patch that adds the external support is not playing
> nicely (I haven’t looked why) with the existing framework.
>

I uploaded a new version to fix the issue you mentioned and now
-global-merge-on-external will not affect stack variable merge any longer.

Thanks,
-Jiangning
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