[llvm] [MIR][MachineInstr] Update MachineInstr::eraseFromParent() to return an iterator (PR #179787)

[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/40870

<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 :: IR/./MLIRIRTests/0/142 (3960 of 3970)
PASS: MLIR-Unit :: Interfaces/./MLIRInterfacesTests/11/25 (3961 of 3970)
PASS: MLIR-Unit :: IR/./MLIRIRTests/38/142 (3962 of 3970)
PASS: MLIR-Unit :: IR/./MLIRIRTests/37/142 (3963 of 3970)
PASS: MLIR-Unit :: Pass/./MLIRPassTests/11/14 (3964 of 3970)
PASS: MLIR-Unit :: Interfaces/./MLIRInterfacesTests/13/25 (3965 of 3970)
PASS: MLIR :: mlir-runner/utils.mlir (3966 of 3970)
PASS: MLIR :: mlir-tblgen/op-error.td (3967 of 3970)
PASS: MLIR :: mlir-reduce/dce-test.mlir (3968 of 3970)
PASS: MLIR :: Pass/pipeline-options-parsing.mlir (3969 of 3970)
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=2353.836775

```

</details>

https://github.com/llvm/llvm-project/pull/179787