[clang] [clang] Deduplicate the logic that only warns once when stack is almost full (PR #112371)

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

Adding @ChuanqiXu9 to get another pair of eyes on it (for naming, code structure, etc). I believe he was involved in reviewing some changes touching `runWithSufficientStackSpace` I've previously sent.

Please give him a chance to review this.

https://github.com/llvm/llvm-project/pull/112371