[llvm] [VPlan] Detect and create partial reductions in VPlan. (NFCI) (PR #167851)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `lldb-aarch64-windows` running on `linaro-armv8-windows-msvc-05` while building `llvm` at step 6 "test".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/141/builds/14884

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

```
Step 6 (test) failure: build (failure)
...
UNSUPPORTED: lldb-api :: tools/lldb-server/TestGdbRemotePlatformFile.py (1322 of 2426)
PASS: lldb-api :: tools/lldb-server/TestGdbRemoteProcessInfo.py (1323 of 2426)
PASS: lldb-api :: tools/lldb-server/TestGdbRemoteRegisterState.py (1324 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/TestGdbRemoteSaveCore.py (1325 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/TestGdbRemoteSingleStep.py (1326 of 2426)
PASS: lldb-api :: tools/lldb-server/TestGdbRemoteThreadsInStopReply.py (1327 of 2426)
PASS: lldb-api :: tools/lldb-server/TestGdbRemote_qMemoryRegion.py (1328 of 2426)
PASS: lldb-api :: tools/lldb-server/TestGdbRemote_qRegisterInfo.py (1329 of 2426)
PASS: lldb-api :: tools/lldb-server/TestGdbRemote_qThreadStopInfo.py (1330 of 2426)
TIMEOUT: lldb-api :: lang/c/step_over_no_deadlock/TestStepOverDoesntBlock.py (1331 of 2426)
******************** TEST 'lldb-api :: lang/c/step_over_no_deadlock/TestStepOverDoesntBlock.py' FAILED ********************
Script:
--
C:/Users/tcwg/scoop/apps/python/current/python.exe C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/llvm-project/lldb\test\API\dotest.py -u CXXFLAGS -u CFLAGS --env LLVM_LIBS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --env LLVM_INCLUDE_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/include --env LLVM_TOOLS_DIR=C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --arch aarch64 --build-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex --lldb-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-lldb\lldb-api --clang-module-cache-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/lldb-test-build.noindex/module-cache-clang\lldb-api --executable C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/lldb.exe --compiler C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/clang.exe --dsymutil C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin/dsymutil.exe --make C:/Users/tcwg/scoop/shims/make.exe --llvm-tools-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./bin --lldb-obj-root C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/tools/lldb --lldb-libs-dir C:/Users/tcwg/llvm-worker/lldb-aarch64-windows/build/./lib --cmake-build-type Release --skip-category=watchpoint C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\llvm-project\lldb\test\API\lang\c\step_over_no_deadlock -p TestStepOverDoesntBlock.py
--
Exit Code: 15
Timeout: Reached timeout of 600 seconds

Command Output (stdout):
--
lldb version 23.0.0git (https://github.com/llvm/llvm-project.git revision f4e8cc1a2229dca76d21c8d37439c4c194b06b86)
  clang revision f4e8cc1a2229dca76d21c8d37439c4c194b06b86
  llvm revision f4e8cc1a2229dca76d21c8d37439c4c194b06b86

--
Command Output (stderr):
--
UNSUPPORTED: LLDB (C:\Users\tcwg\llvm-worker\lldb-aarch64-windows\build\bin\clang.exe-aarch64) :: test_step_over_dsym (TestStepOverDoesntBlock.StepOverDoesntDeadlockTestCase.test_step_over_dsym) (test case does not fall in any category of interest for this run) 


--

********************
PASS: lldb-api :: tools/lldb-server/TestGdbRemote_vCont.py (1332 of 2426)
PASS: lldb-api :: tools/lldb-server/TestNonStop.py (1333 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/TestPtyServer.py (1334 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/attach-wait/TestGdbRemoteAttachWait.py (1335 of 2426)
PASS: lldb-api :: tools/lldb-server/commandline/TestGdbRemoteConnection.py (1336 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/commandline/TestStubSetSID.py (1337 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/inferior-crash/TestGdbRemoteAbort.py (1338 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/inferior-crash/TestGdbRemoteSegFault.py (1339 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/libraries-svr4/TestGdbRemoteLibrariesSvr4Support.py (1340 of 2426)
PASS: lldb-api :: tools/lldb-server/memory-allocation/TestGdbRemoteMemoryAllocation.py (1341 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/memory-tagging/TestGdbRemoteMemoryTagging.py (1342 of 2426)
PASS: lldb-api :: tools/lldb-server/TestLldbGdbServer.py (1343 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/register-reading/TestGdbRemoteGPacket.py (1344 of 2426)
PASS: lldb-api :: tools/lldb-server/qSupported/TestGdbRemote_qSupported.py (1345 of 2426)
UNSUPPORTED: lldb-api :: tools/lldb-server/signal-filtering/TestGdbRemote_QPassSignals.py (1346 of 2426)
PASS: lldb-api :: tools/lldb-server/registers-target-xml-reading/TestGdbRemoteTargetXmlPacket.py (1347 of 2426)

```

</details>

https://github.com/llvm/llvm-project/pull/167851