[llvm] [test] Disable makeAllowedFCmpRegion due to taking too long (PR #111056)

[Matt Arsenault via llvm-commits]

arsenm wrote:

> I am sorry I cannot make it faster on debug build. @aeubanks Can you make these exhaustive tests guarded by `#ifndef NDEBUG`?

NDEBUG won't catch debug build, and this should still run in rel + asserts. EXPENSIVE_CHECKS maybe? 

Maybe there is something else to speed it up? 



https://github.com/llvm/llvm-project/pull/111056