[llvm-branch-commits] [clang] release/18.x: Backport PR86914 "Fix a CTAD regression after 42239d2e9" (PR #87084)

[Younan Zhang via llvm-branch-commits]

zyn0217 wrote:

@tstellar thanks!

> Fixed a regression in CTAD of clang 18 that a friend declaration that befriends itself may cause incorrect constraint substitution.

is just fine to me.

https://github.com/llvm/llvm-project/pull/87084