[llvm] [DFAJumpThreading] Prevent pass from using too much memory. (PR #153193)

[Alan Phipps via llvm-commits]

evodius96 wrote:

> This case seems very obscure to me, and I don't see how to compose a direct test for this. @evodius96, could you, please, show a minimized version of test that triggered this corner case if you can?

Unfortunately it is obscure and very difficult to put together a useful reproducible test case outside of our downstream toolchain. However, I think it's a reasonable check to do.

https://github.com/llvm/llvm-project/pull/153193