[lld] [lld-macho] Parallelize ObjFile::sourceFile() during STABS emission. (PR #222087)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- lld/MachO/SyntheticSections.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/lld/MachO/SyntheticSections.cpp b/lld/MachO/SyntheticSections.cpp
index a179f7edd..b977b5e0a 100644
--- a/lld/MachO/SyntheticSections.cpp
+++ b/lld/MachO/SyntheticSections.cpp
@@ -1264,7 +1264,7 @@ void SymtabSection::emitStabs() {
 
   std::vector<ObjFile *> stabFiles;
   for (const SortingPair &pair : symbolsNeedingStabs) {
-    ObjFile* file = cast<ObjFile>(pair.first->originalIsec->getFile());
+    ObjFile *file = cast<ObjFile>(pair.first->originalIsec->getFile());
     if (stabFiles.empty() || stabFiles.back() != file)
       stabFiles.push_back(file);
   }

``````````

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https://github.com/llvm/llvm-project/pull/222087