[clang] [clang][bytecode] Fix already initializing _Complex UO_Not (PR #181323)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `arc-builder` running on `arc-worker` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/3/builds/28510

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

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM-Unit :: CAS/./CASTests/20/24' FAILED ********************
Script(shard):
--
GTEST_OUTPUT=json:/buildbot/worker/arc-folder/build/unittests/CAS/./CASTests-LLVM-Unit-6794-20-24.json GTEST_SHUFFLE=0 GTEST_TOTAL_SHARDS=24 GTEST_SHARD_INDEX=20 /buildbot/worker/arc-folder/build/unittests/CAS/./CASTests
--

Script:
--
/buildbot/worker/arc-folder/build/unittests/CAS/./CASTests --gtest_filter=CASProgramTest.MappedFileRegionArenaTest
--
Note: Google Test filter = CASProgramTest.MappedFileRegionArenaTest
[==========] Running 1 test from 1 test suite.
[----------] Global test environment set-up.
[----------] 1 test from CASProgramTest
/buildbot/worker/arc-folder/llvm-project/llvm/unittests/CAS/ProgramTest.cpp:148: Failure
Value of: PI.ReturnCode == 0
  Actual: false
Expected: true


/buildbot/worker/arc-folder/llvm-project/llvm/unittests/CAS/ProgramTest.cpp:148
Value of: PI.ReturnCode == 0
  Actual: false
Expected: true



********************


```

</details>

https://github.com/llvm/llvm-project/pull/181323