Use the stdlib more instead of defining methods in dotc.util

[hamzaremmal]

• use methods that are already defined in the stdlib (11e4266, c6fe605)
• remove empty files (3bddc16)

[som-snytt]

I would expect the PR to improve library first, and this second.

[hamzaremmal]

I would expect the PR to improve library first

What do you have in mind?

[som-snytt]

util.chaining was the first thing people wanted to inline. I guess -> is the second. #24715

[hamzaremmal]

util.chaining was the first thing people wanted to inline. I guess -> is the second. #24715

Aaah, I see what you mean. Sure. This could (will?) be done soon. Even if I do it, it will not be merged until we start working on 3.10.
This PR is just about removing duplicates in the complier codebase. It can always use the new versions later without requiring any changes.

[som-snytt]

I would pause this change until the improvements land, since that was the reason to use compiler util in the first place. The difference is potentially severe, since .tap could turn up in hot code and is supposed to be without cost.

[hamzaremmal]

It is here: #24725.

[bishabosha]

lets say blocked until non-bootstrapped compiler uses result of #24725?