This patch updates the submodules to:
- llvm: 3f8d8c1aac3086f603ad73f18fe2bd4fb91fa10a
- mhlo: 4384a47b03dc377d651523037867899a340b0e96
The only change made is calling `registerAllExtensions` during dialect
registration. See: https://reviews.llvm.org/D120368
This commit (with approval from all contributors) dual licenses
the torch-mlir project under both the standard LLVM license and the
standard PyTorch license. This will facilitate moving code between
torch-mlir and the two upstream projects.
The standard file comment is now:
```
// This file is licensed under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// Also available under a BSD-style license. See LICENSE.
```
See `LICENSE` in the project root for the terms of both licenses.