[llvm] Fixed build with C++20 standard (PR #169772)

[LLVM Continuous Integration via llvm-commits]

Vedran =?utf-8?q?Miletić?= <vedran at miletic.net>,
Vedran =?utf-8?q?Miletić?= <vedran at miletic.net>,
Vedran =?utf-8?q?Miletić?= <vedran at miletic.net>
Message-ID:
In-Reply-To: <llvm.org/llvm/llvm-project/pull/169772 at github.com>


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/35481

<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 :: Dialect/SparseTensor/./MLIRSparseTensorTests/95/210 (3773 of 3784)
PASS: MLIR-Unit :: Dialect/SparseTensor/./MLIRSparseTensorTests/97/210 (3774 of 3784)
PASS: MLIR-Unit :: IR/./MLIRIRTests/0/131 (3775 of 3784)
PASS: MLIR-Unit :: IR/./MLIRIRTests/39/131 (3776 of 3784)
PASS: MLIR-Unit :: IR/./MLIRIRTests/38/131 (3777 of 3784)
PASS: MLIR-Unit :: Interfaces/./MLIRInterfacesTests/11/22 (3778 of 3784)
PASS: MLIR-Unit :: Interfaces/./MLIRInterfacesTests/12/22 (3779 of 3784)
PASS: MLIR-Unit :: Interfaces/./MLIRInterfacesTests/13/22 (3780 of 3784)
PASS: MLIR-Unit :: Pass/./MLIRPassTests/11/14 (3781 of 3784)
PASS: MLIR :: mlir-reduce/dce-test.mlir (3782 of 3784)
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=4205.691615

```

</details>

https://github.com/llvm/llvm-project/pull/169772