[llvm] [ExecutionEngine] reinstate necessary include for building with `-DLLVM_USE_INTEL_JITEVENTS` (PR #117949)

[via llvm-commits]

h-vetinari wrote:

Fine by me to put it behind the `#if` as well - I just put it where it had been pre-https://github.com/llvm/llvm-project/commit/1f4d91ecb8529678a3d3919d7523743bd21942ca

https://github.com/llvm/llvm-project/pull/117949