[llvm] [SandboxVec][DAG] Mark UnscheduledSuccs as invalid when vectorized (PR #185519)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Windows-->
# :window: Windows x64 Test Results

* 132006 tests passed
* 2987 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM-Unit
<details>
<summary>LLVM-Unit.Transforms/Vectorize/SandboxVectorizer/_/SandboxVectorizerTests_exe/DependencyGraphTest/MaintainUnscheduledSuccsWhenScheduled</summary>

```
Script:
--
C:\_work\llvm-project\llvm-project\build\unittests\Transforms\Vectorize\SandboxVectorizer\.\SandboxVectorizerTests.exe --gtest_filter=DependencyGraphTest.MaintainUnscheduledSuccsWhenScheduled
--
C:\_work\llvm-project\llvm-project\llvm\unittests\Transforms\Vectorize\SandboxVectorizer\DependencyGraphTest.cpp:1265
Death test: Add0N->getNumUnscheduledSuccs()
    Result: failed to die.
 Error msg:
[  DEATH   ] 

C:\_work\llvm-project\llvm-project\llvm\unittests\Transforms\Vectorize\SandboxVectorizer\DependencyGraphTest.cpp:1274
Death test: Add1N->getNumUnscheduledSuccs()
    Result: failed to die.
 Error msg:
[  DEATH   ] 

C:\_work\llvm-project\llvm-project\llvm\unittests\Transforms\Vectorize\SandboxVectorizer\DependencyGraphTest.cpp:1282
Death test: Add0N->getNumUnscheduledSuccs()
    Result: failed to die.
 Error msg:
[  DEATH   ] 

C:\_work\llvm-project\llvm-project\llvm\unittests\Transforms\Vectorize\SandboxVectorizer\DependencyGraphTest.cpp:1284
Death test: Add1N->getNumUnscheduledSuccs()
    Result: failed to die.
 Error msg:
[  DEATH   ] 


```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/185519