Add llvm.looptrap intrinsic. The '``llvm.looptrap``' intrinsic is equivalent to ``llvm.cond.loop(true)``, but is also considered to be ``noreturn``, which enables certain optimizations by allowing the optimizer to assume that a branch leading to a call to this intrinsic was not taken. A late optimization pass will convert this intrinsic to either ``llvm.cond.loop(true)`` or ``llvm.cond.loop(pred)``, where ``pred`` is a predicate for a conditional branch leading to the intrinsic call, if possible. Reviewers: fmayer, vitalybuka Pull Request: https://github.com/llvm/llvm-project/pull/181299
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