[clang] [LifetimeSafety] Use ImmutableList for buildOriginFlowChain DFS nodes (PR #208890)

[via cfe-commits]

github-actions[bot] wrote:

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

* 55762 tests passed
* 1379 tests skipped
* 5 tests failed

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

### Clang-Unit
<details>
<summary>Clang-Unit._/AllClangUnitTests_exe/LifetimeAnalysisTest/BuildOriginFlowChain</summary>

```
Script:
--
C:\_work\llvm-project\llvm-project\build\tools\clang\unittests\.\AllClangUnitTests.exe --gtest_filter=LifetimeAnalysisTest.BuildOriginFlowChain
--
unknown file
SEH exception with code 0x3221225477 thrown in the test body.
Stack trace:



```
</details>
<details>
<summary>Clang-Unit._/AllClangUnitTests_exe/LifetimeAnalysisTest/BuildOriginFlowChainWithLifetimeBound</summary>

```
Script:
--
C:\_work\llvm-project\llvm-project\build\tools\clang\unittests\.\AllClangUnitTests.exe --gtest_filter=LifetimeAnalysisTest.BuildOriginFlowChainWithLifetimeBound
--
unknown file
SEH exception with code 0x3221225477 thrown in the test body.
Stack trace:



```
</details>
<details>
<summary>Clang-Unit._/AllClangUnitTests_exe/LifetimeAnalysisTest/BuildOriginFlowChainWithMultiAssignInSameStmt</summary>

```
Script:
--
C:\_work\llvm-project\llvm-project\build\tools\clang\unittests\.\AllClangUnitTests.exe --gtest_filter=LifetimeAnalysisTest.BuildOriginFlowChainWithMultiAssignInSameStmt
--
unknown file
SEH exception with code 0x3221225477 thrown in the test body.
Stack trace:



```
</details>
<details>
<summary>Clang-Unit._/AllClangUnitTests_exe/LifetimeAnalysisTest/BuildOriginFlowChainWithOverwritingAssignments</summary>

```
Script:
--
C:\_work\llvm-project\llvm-project\build\tools\clang\unittests\.\AllClangUnitTests.exe --gtest_filter=LifetimeAnalysisTest.BuildOriginFlowChainWithOverwritingAssignments
--
unknown file
SEH exception with code 0x3221225477 thrown in the test body.
Stack trace:



```
</details>
<details>
<summary>Clang-Unit._/AllClangUnitTests_exe/LifetimeAnalysisTest/BuildOriginFlowChainWithSelfAssignment</summary>

```
Script:
--
C:\_work\llvm-project\llvm-project\build\tools\clang\unittests\.\AllClangUnitTests.exe --gtest_filter=LifetimeAnalysisTest.BuildOriginFlowChainWithSelfAssignment
--
unknown file
SEH exception with code 0x3221225477 thrown in the test body.
Stack trace:



```
</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/208890