[llvm] Frontend: Adopt llvm::vfs::OutputBackend in CompilerInstance (PR #113364)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/include/clang/Frontend/CompilerInstance.h clang/lib/Frontend/CompilerInstance.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Frontend/CompilerInstance.cpp b/clang/lib/Frontend/CompilerInstance.cpp
index 54d20fe41..8d1e9d6cd 100644
--- a/clang/lib/Frontend/CompilerInstance.cpp
+++ b/clang/lib/Frontend/CompilerInstance.cpp
@@ -844,8 +844,7 @@ void CompilerInstance::setOutputManager(
 
 void CompilerInstance::createOutputManager() {
   assert(!OutputMgr && "Already has an output manager");
-  OutputMgr =
-      llvm::makeIntrusiveRefCnt<llvm::vfs::OnDiskOutputBackend>();
+  OutputMgr = llvm::makeIntrusiveRefCnt<llvm::vfs::OnDiskOutputBackend>();
 }
 
 llvm::vfs::OutputBackend &CompilerInstance::getOutputManager() {

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https://github.com/llvm/llvm-project/pull/113364