[llvm] [PowerPC] TableGen-erate SDNode descriptions (PR #168108)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `clang-with-lto-ubuntu` running on `as-worker-91` while building `llvm` at step 7 "test-stage1-compiler".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/49/builds/2570

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

```
Step 7 (test-stage1-compiler) failure: build (failure)
...
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:534: note: using ld64.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld64.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:534: note: using wasm-ld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/wasm-ld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/utils/lit/tests/lit.cfg:111: warning: Setting a timeout per test not supported. Requires the Python psutil module but it could not be found. Try installing it via pip or via your operating system's package manager.
 Some tests will be skipped and the --timeout command line argument will not work.
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:534: note: using ld.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:534: note: using lld-link: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/lld-link
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:534: note: using ld64.lld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/ld64.lld
llvm-lit: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/utils/lit/lit/llvm/config.py:534: note: using wasm-ld: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/wasm-ld
-- Testing: 88973 tests, 72 workers --
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80..
FAIL: LLVM :: tools/llvm-exegesis/RISCV/rvv/filter.test (78736 of 88973, 3 of 3 attempts)
******************** TEST 'LLVM :: tools/llvm-exegesis/RISCV/rvv/filter.test' FAILED ********************
Exit Code: 2

Command Output (stdout):
--
# RUN: at line 1
/home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/llvm-exegesis -mtriple=riscv64 -mcpu=sifive-x280 -benchmark-phase=assemble-measured-code --mode=inverse_throughput --opcode-name=PseudoVNCLIPU_WX_M1_MASK     --riscv-filter-config='vtype = {VXRM: rod, AVL: VLMAX, SEW: e(8|16), Policy: ta/mu}' --max-configs-per-opcode=1000 --min-instructions=10 | /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/tools/llvm-exegesis/RISCV/rvv/filter.test
# executed command: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/llvm-exegesis -mtriple=riscv64 -mcpu=sifive-x280 -benchmark-phase=assemble-measured-code --mode=inverse_throughput --opcode-name=PseudoVNCLIPU_WX_M1_MASK '--riscv-filter-config=vtype = {VXRM: rod, AVL: VLMAX, SEW: e(8|16), Policy: ta/mu}' --max-configs-per-opcode=1000 --min-instructions=10
# .---command stderr------------
# | PseudoVNCLIPU_WX_M1_MASK: Failed to produce any snippet via: instruction has tied variables, avoiding Read-After-Write issue, picking random def and use registers not aliasing each other, for uses, one unique register for each position
# `-----------------------------
# executed command: /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/tools/llvm-exegesis/RISCV/rvv/filter.test
# .---command stderr------------
# | FileCheck error: '<stdin>' is empty.
# | FileCheck command line:  /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/bin/FileCheck /home/buildbot/as-worker-91/clang-with-lto-ubuntu/llvm-project/llvm/test/tools/llvm-exegesis/RISCV/rvv/filter.test
# `-----------------------------
# error: command failed with exit status: 2

--

********************
Testing:  0.. 10.. 20.. 30.. 40.. 50.. 60.. 70.. 80.. 90.. 

1 warning(s) in tests
********************
Failed Tests (1):
  LLVM :: tools/llvm-exegesis/RISCV/rvv/filter.test


Testing Time: 254.85s

Total Discovered Tests: 122768
  Skipped          :     24 (0.02%)
  Unsupported      :   3157 (2.57%)
  Passed           : 119386 (97.25%)
  Expectedly Failed:    200 (0.16%)
  Failed           :      1 (0.00%)
FAILED: CMakeFiles/check-all /home/buildbot/as-worker-91/clang-with-lto-ubuntu/build/stage1/CMakeFiles/check-all 

```

</details>

https://github.com/llvm/llvm-project/pull/168108