[llvm] [PatternMatch] Fix issue of stale reference in new `m_{I,F,}Cmp` matchers (PR #98866)

[Vitaly Buka via llvm-commits]

vitalybuka wrote:

It's not fixed, or fix incomplete: https://lab.llvm.org/staging/#/builders/89/builds/819

https://github.com/llvm/llvm-project/pull/98866