[lldb] [llvm] [dsymutil] Avoid copying binary swiftmodules built from textual (PR #134719)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `polly-x86_64-linux-shared-plugin` running on `polly-x86_64-gce2` while building `lldb,llvm` at step 5 "build".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/118/builds/5634

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

```
Step 5 (build) failure: 'ninja' (failure)

```

</details>

https://github.com/llvm/llvm-project/pull/134719