[clang] [clang] Lifetimebound in assignment operator should work for non-gsl annotated types. (PR #113180)

[LLVM Continuous Integration via cfe-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-x86_64-darwin` running on `doug-worker-3` while building `clang` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/23/builds/4066

<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 'Clang :: SemaCXX/attr-lifetimebound.cpp' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 1: /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/clang -cc1 -internal-isystem /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/lib/clang/20/include -nostdsysteminc -std=c++23 -verify /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/SemaCXX/attr-lifetimebound.cpp
+ /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/bin/clang -cc1 -internal-isystem /Volumes/RAMDisk/buildbot-root/x86_64-darwin/build/lib/clang/20/include -nostdsysteminc -std=c++23 -verify /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/SemaCXX/attr-lifetimebound.cpp
error: 'expected-warning' diagnostics expected but not seen: 
  File /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/SemaCXX/attr-lifetimebound.cpp Line 333: object backing the foo1 will be destroyed at the end
  File /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/SemaCXX/attr-lifetimebound.cpp Line 335: object backing the foo2 will be destroyed at the end
error: 'expected-warning' diagnostics seen but not expected: 
  File /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/SemaCXX/attr-lifetimebound.cpp Line 333: object backing foo1 will be destroyed at the end of the full-expression
  File /Volumes/RAMDisk/buildbot-root/x86_64-darwin/llvm-project/clang/test/SemaCXX/attr-lifetimebound.cpp Line 335: object backing foo2 will be destroyed at the end of the full-expression
4 errors generated.

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/113180