[llvm] [DirectX] Remove intrinsic definitions with no use (PR #133459)

[Farzon Lotfi via llvm-commits]

farzonl wrote:

> 3. It's surprising that this change didn't need an update to `test/CodeGen/DirectX/llc-pipeline.ll

FileCheck Doesn't care about the whitespace differences and the FunctionPass Manager was already invoked for `DXIL Resource Access` So this just falls back a level to the top level `ModulePass Manager`



https://github.com/llvm/llvm-project/pull/133459