[llvm] [NFC][SpecialCaseList] Remove LLVM_ABI from SpecialCaseList::Matcher::preprocess. (PR #164526)

[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/31922

<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 :: Target/LLVM/./MLIRTargetLLVMTests/2/5 (3589 of 3600)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/0/5 (3590 of 3600)
PASS: MLIR :: mlir-runner/utils.mlir (3591 of 3600)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/3/5 (3592 of 3600)
PASS: MLIR-Unit :: Target/LLVM/./MLIRTargetLLVMTests/1/5 (3593 of 3600)
PASS: MLIR :: mlir-tblgen/llvm-intrinsics.td (3594 of 3600)
PASS: MLIR :: Dialect/Vector/vector-tofrom-elements-to-shuffle-tree-transforms.mlir (3595 of 3600)
PASS: MLIR-Unit :: IR/./MLIRIRTests/99/130 (3596 of 3600)
PASS: MLIR :: mlir-tblgen/op-error.td (3597 of 3600)
PASS: MLIR :: Pass/pipeline-options-parsing.mlir (3598 of 3600)
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=1348.928271

```

</details>

https://github.com/llvm/llvm-project/pull/164526