[clang] [Clang] Fix leftover use of old LTO path (PR #201360)

[Nick Sarnie via cfe-commits]

sarnex wrote:

@jhuber6 Sorry seeing some lit fails on our buildbot:

<img width="351" height="254" alt="image" src="https://github.com/user-attachments/assets/a0ff498e-f1c8-47a3-a46d-100fd6e98a12" />

https://lab.llvm.org/staging/#/builders/225/builds/2443


https://github.com/llvm/llvm-project/pull/201360