[llvm-branch-commits] [InstCombiner] Remove unused `llvm.experimental.hot()` (PR #84851)

[Vitaly Buka via llvm-branch-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/84851

Intrinsic declared to have sideeffects, but it's done only to prevent
moving it. Removing unused ones is OK.