[llvm] [DebugInfo] Add DW_AT_artificial for compiler generated static member. (PR #115851)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-clang-aarch64-darwin` running on `doug-worker-5` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/190/builds/9521

<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 :: DebugInfo/Generic/artificial-static-member.ll' FAILED ********************
Exit Code: 2

Command Output (stderr):
--
RUN: at line 1: /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -O0 -filetype=obj < /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/artificial-static-member.ll |    /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-dwarfdump --debug-info - | /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/artificial-static-member.ll
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc -O0 -filetype=obj
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/artificial-static-member.ll
+ /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llvm-dwarfdump --debug-info -
/Users/buildbot/buildbot-root/aarch64-darwin/build/bin/llc: error: unable to get target for 'x86_64-pc-linux-gnu', see --version and --triple.error: -: The file was not recognized as a valid object file
FileCheck error: '<stdin>' is empty.
FileCheck command line:  /Users/buildbot/buildbot-root/aarch64-darwin/build/bin/FileCheck /Users/buildbot/buildbot-root/aarch64-darwin/llvm-project/llvm/test/DebugInfo/Generic/artificial-static-member.ll

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/115851