[clang] [Clang][Sema] Fix crash with const qualified member operator new (PR #80327)

[Erich Keane via cfe-commits]

https://github.com/erichkeane commented:

I'm not the best reviewer for this, but it looks reasonable to me.  Perhaps Aaron should take a look to make sure?

https://github.com/llvm/llvm-project/pull/80327