[llvm] [AMDGPU] Fix GFX1250 hazard: S_SET_VGPR_MSB dropped (PR #184904)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ppc64le-mlir-rhel-clang` running on `ppc64le-mlir-rhel-test` while building `llvm` at step 6 "test-build-check-mlir-build-only-check-mlir".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/129/builds/40514

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-check-mlir-build-only-check-mlir) failure: 1200 seconds without output running [b'ninja', b'check-mlir'], attempting to kill
...
PASS: MLIR-Unit :: Transforms/./MLIRTransformsTests/1/6 (3939 of 3949)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/0/5 (3940 of 3949)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/3/5 (3941 of 3949)
PASS: MLIR-Unit :: Transforms/./MLIRTransformsTests/5/6 (3942 of 3949)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/2/5 (3943 of 3949)
PASS: MLIR-Unit :: Transforms/./MLIRTransformsTests/2/6 (3944 of 3949)
PASS: MLIR-Unit :: Transforms/./MLIRTransformsTests/4/6 (3945 of 3949)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/1/5 (3946 of 3949)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/4/5 (3947 of 3949)
PASS: MLIR :: Pass/pipeline-options-parsing.mlir (3948 of 3949)
command timed out: 1200 seconds without output running [b'ninja', b'check-mlir'], attempting to kill
process killed by signal 9
program finished with exit code -1
elapsedTime=1425.941262

```

</details>

https://github.com/llvm/llvm-project/pull/184904