[llvm] Revert "Add HexagonGlobalScheduler pass (#180803)" (PR #181418)

[Fateme Hosseini via llvm-commits]

fhossein-quic wrote:

> [d0252a1](https://github.com/llvm/llvm-project/commit/d0252a1013e26a80204e723b0b0aaecfdc3b601a) could fix some (or all if we're lucky) of the problem(s) introduced

If I revert my patch, then this patch also needs to be reverted, right?


https://github.com/llvm/llvm-project/pull/181418