[clang] [clang] Adding an Atomic Line Logger (PR #195885)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/include/clang/Basic/AtomicLineLogger.h clang/lib/Basic/AtomicLineLogger.cpp clang/unittests/Basic/AtomicLineLoggerTest.cpp --diff_from_common_commit
``````````

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The reproduction instructions above might return results for more than one PR
in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Basic/AtomicLineLogger.h b/clang/include/clang/Basic/AtomicLineLogger.h
index cc933cb8b..bcaf3d168 100644
--- a/clang/include/clang/Basic/AtomicLineLogger.h
+++ b/clang/include/clang/Basic/AtomicLineLogger.h
@@ -64,4 +64,3 @@ public:
 } // namespace clang
 
 #endif
-
diff --git a/clang/lib/Basic/AtomicLineLogger.cpp b/clang/lib/Basic/AtomicLineLogger.cpp
index e5c4c4772..bee79e7c0 100644
--- a/clang/lib/Basic/AtomicLineLogger.cpp
+++ b/clang/lib/Basic/AtomicLineLogger.cpp
@@ -75,4 +75,3 @@ LogLine AtomicLineLogger::log() {
     return LogLine(*OS);
   return LogLine();
 }
-
diff --git a/clang/unittests/Basic/AtomicLineLoggerTest.cpp b/clang/unittests/Basic/AtomicLineLoggerTest.cpp
index 4b2c13c25..9d192dbb9 100644
--- a/clang/unittests/Basic/AtomicLineLoggerTest.cpp
+++ b/clang/unittests/Basic/AtomicLineLoggerTest.cpp
@@ -211,4 +211,3 @@ TEST(AtomicLineLoggerTest, ConcurrentWritesProduceCompleteLines) {
     EXPECT_EQ(Pid, (uint64_t)llvm::sys::Process::getProcessId());
   }
 }
-

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https://github.com/llvm/llvm-project/pull/195885