[llvm] [Mips] TableGen-erate SDNode descriptions (PR #168307)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx-nvidia-win` running on `as-builder-8` while building `llvm` at step 7 "test-build-unified-tree-check-llvm".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/54/builds/15309

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

```
Step 7 (test-build-unified-tree-check-llvm) failure: test (failure)
******************** TEST 'LLVM-Unit :: Support/./SupportTests.exe/86/209' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:C:\buildbot\as-builder-8\llvm-nvptx-nvidia-win\build\unittests\Support\.\SupportTests.exe-LLVM-Unit-34608-86-209.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=209 GTEST_SHARD_INDEX=86 C:\buildbot\as-builder-8\llvm-nvptx-nvidia-win\build\unittests\Support\.\SupportTests.exe
--


Note: This is test shard 87 of 209.

[==========] Running 8 tests from 8 test suites.

[----------] Global test environment set-up.

[----------] 1 test from BinaryStreamTest

[ RUN      ] BinaryStreamTest.StreamReaderIntegers

[       OK ] BinaryStreamTest.StreamReaderIntegers (0 ms)

[----------] 1 test from BinaryStreamTest (0 ms total)



[----------] 1 test from DataExtractorTest

[ RUN      ] DataExtractorTest.getU24

[       OK ] DataExtractorTest.getU24 (0 ms)

[----------] 1 test from DataExtractorTest (0 ms total)



[----------] 1 test from HashBuilderTest/3, where TypeParam = <type>

[ RUN      ] HashBuilderTest/3.HashStringRef

[       OK ] HashBuilderTest/3.HashStringRef (0 ms)

[----------] 1 test from HashBuilderTest/3 (0 ms total)



[----------] 1 test from OverflowTest/2, where TypeParam = <type>

[ RUN      ] OverflowTest/2.MulOverflowToMin

[       OK ] OverflowTest/2.MulOverflowToMin (0 ms)

[----------] 1 test from OverflowTest/2 (0 ms total)
...

```

</details>

https://github.com/llvm/llvm-project/pull/168307