[flang-commits] [clang] [clang-tools-extra] [flang] Fix OOM in FormatDiagnostic (2nd attempt) (PR #108866)

[Vakhurin Sergei via flang-commits]

igelbox wrote:

30 of 31, this time is much closer)
<img width="464" alt="image" src="https://github.com/user-attachments/assets/de806772-30df-42bd-9928-19bad35dca02">

it seems like [those](https://lab.llvm.org/buildbot/#/builders/73) builds were broken a couple hours ago:
<img width="377" alt="image" src="https://github.com/user-attachments/assets/c375276a-d3ac-4e09-a6fd-2a2aced0539c">


https://github.com/llvm/llvm-project/pull/108866