This
seems like it has something to do with conflicting files. And this 
…along with this 
Seems to confirm it. Which means you’re trying to install, or use, or upgrade both at the same time, while you can obviously not.
So, you need to decide which one you want, and only one, and install that.
For pahole-git, which is an AUR package:
pamac build pahole-git
For pahole, which is in the community repository:
pamac install pahole
Further reading:
Tip:
If your language isn’t English, please prepend any and all terminal commands with LC_ALL=C. For example:
LC_ALL=C bluetoothctl
This will just cause the terminal output to be in English, making it easier to understand and debug.
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