[PATCH] D152108: [ADT] Deprecate StringRef::{starts,ends}with_insensitive

[Fangrui Song via Phabricator via llvm-commits]

MaskRay added a comment.

In D152108#4449023 <https://reviews.llvm.org/D152108#4449023>, @tmatheson wrote:

> Do we need to deprecate, or can we simply remove the old definitions?

`startswith_insensitive` appears to be used rare enough, mostly used within llvm-project. I think we can just remove them.


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