[llvm] [DebugLine] Correct debug line emittion (PR #157529)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-rel-x86-64` running on `ml-opt-rel-x86-64-b1` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/185/builds/25273

<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/ARM/stmt_seq_macho.test' FAILED ********************
Exit Code: 127

Command Output (stdout):
--
# RUN: at line 1
split-file /b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/DebugInfo/ARM/stmt_seq_macho.test /b/ml-opt-rel-x86-64-b1/build/test/DebugInfo/ARM/Output/stmt_seq_macho.test.tmp
# executed command: split-file /b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/DebugInfo/ARM/stmt_seq_macho.test /b/ml-opt-rel-x86-64-b1/build/test/DebugInfo/ARM/Output/stmt_seq_macho.test.tmp
# RUN: at line 3
clang++ --target=arm64-apple-macos11    /b/ml-opt-rel-x86-64-b1/build/test/DebugInfo/ARM/Output/stmt_seq_macho.test.tmp/stmt_seq_macho.cpp -o /b/ml-opt-rel-x86-64-b1/build/test/DebugInfo/ARM/Output/stmt_seq_macho.test.tmp/stmt_seq_macho.o    -g -Oz -gdwarf-4 -c -mno-outline    -mllvm -emit-func-debug-line-table-offsets    -fdebug-compilation-dir=/private/tmp/stmt_seq    -fno-unwind-tables -fno-exceptions
# executed command: clang++ --target=arm64-apple-macos11 /b/ml-opt-rel-x86-64-b1/build/test/DebugInfo/ARM/Output/stmt_seq_macho.test.tmp/stmt_seq_macho.cpp -o /b/ml-opt-rel-x86-64-b1/build/test/DebugInfo/ARM/Output/stmt_seq_macho.test.tmp/stmt_seq_macho.o -g -Oz -gdwarf-4 -c -mno-outline -mllvm -emit-func-debug-line-table-offsets -fdebug-compilation-dir=/private/tmp/stmt_seq -fno-unwind-tables -fno-exceptions
# .---command stderr------------
# | 'clang++': command not found
# `-----------------------------
# error: command failed with exit status: 127

--

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


```

</details>

https://github.com/llvm/llvm-project/pull/157529