tree 13ef9e012cc062c0ec855234ae358d468a7183aa
parent 35ba2feaa1ca3088e0de36dc816f244e248c7669
author Lukasz Anforowicz <lukasza@google.com> 1669249089 -0800
committer Copybara-Service <copybara-worker@google.com> 1669249126 -0800

s/ `String` / `Rc<str>` / in `NamespaceQualifier` and `ir::Identifier`.

This CL was motivated by trying to improve the efficiency of
`NamespaceQualifier`'s `Clone` implementation - cloning of `Rc<str>`
requires just increasing the ref-count and is therefore cheaper than
cloning of `String` which requires a heap allocation and copying the
string contents.

This CL also changes the type of `ir::Identifier` because this is
the representation of `ir::Namespace::name`.

`Rc<str>` instead of `String` is possible because these strings are
never mutated.

PiperOrigin-RevId: 490605310