[clang] [llvm] [llvm][clang] Allocate a new stack instead of spawning a new thread to get more stack space (PR #133173)

[Arthur Eubanks via llvm-commits]

aeubanks wrote:

I'm guessing that a stage2 build of clang would probably repro the issue, perhaps this was tested against older clangs that didn't warn on this.

https://github.com/llvm/llvm-project/pull/133173